Note: Descriptions are shown in the official language in which they were submitted.
7~--146
IRE~lYENr OF MET~L hITH
DERIVAlIVE-OF PoLY-~LRæ~hLEIENOL
CF ~E ~CN
The present inNentiOn relates to the art of metal
surfaoe treatment. More specifically, the present invention
relates to treat~ent of metal surfaces with a solution of a
- poly-aLkenylphenol derivative or an acid salt of a poly-
alke~ylphenol derivative. The treatment imparts improved
corrosion resistan oe a~nd paint adhesion characteristics to the
metal surfa oe s.
The need for applying protective ooatings to metal
surfa oes for improved col~usian resistanoe and paint adhesion
characberistics is wel1 kncwn in the metal finishing and other
metal arts. Traditionally, metal surfaoe s are treated with
chemicals which form a metal phosphate and/or metal oxide
oonversion coating on the metal surfa oe to improve the oorrosion
resistance and Faint adhesion thereof. Also traditionally, the
COnversiQn coated metal surfaces have been rinsed or post-treated
with a solutian containin~ a hexavalent chromium compound for
even greater oorrosion resistance and Faint adhesion.
Because of the toxic nature of hexavalent chrcmium
campounds, expensive treat~ent equipment must be used to remove
chronates from plant effluent to prevent the pollution of rivers,
,
streams, and drinking wat~r sources. ~ence, although the
corrosion resistance and paint ad~esion characteristics of
oonversion coated me*21 surfaces can be enhanced ~y an af-
ter-treat~ent solution o~ntainIng a hcxavalent chrc~ium
ccDçx~und, in recent years there have been research and
development efforts directed to ~iscovering effective
alternatives to the use of such post-treatment solutions.
One alternative is provide~ in applicant's U~S. patent
number 4,376,000 of March 8, 1983, entitle~d "Conpositicn
for and Method of After-Treatment of Phosphatized Metal
Surfaces". The post-treatnent oompound according to this
patent is used in post-treatment solutions having an
aIkaline pH. It would, however, be desirable to have a
post-treatment compound useful in post-treatment solutions
over a brc,ad pH range and, in particular, useful in an
acidic post-treatment solution.
In aocordance with the present invention a nDvel
composition which is an alternative to hexavalent chrcmiuD
oompound oontaining solutions is pr wided for use in post-
tr~atnent solutions in a novel process for the post-treat-
ment of phosphatized or conversion coated metal surf~rPs.
Also, the present invention provides a solution and me*hod
for treating previously untreated metal surfaces i~cluaing
aluminum, steel and zinc nEtal surfaces. The solution and
mE~x~d of the present invention provide a ccating on the
netal surface and are effective to enhance the corr~sion
resist~no_ and paint adhesion characteristics of the metal
7~
surface whether previcusly conversion coated or nok. Fur-
ther understanding of t~is invention wqll be had from the
following disclosure wherein all parts and percentages
are by weight unless otherwise indicated.
2A
:~.
~'~ti7'7'~
S~ CF ~HE ~3VE~aN
In accordance wlth the present invention, a metal
surface is treated by oontacting the metal surface with a
solution compxising an effective amDunt of a soluble or
dispersible treatment ccmpound selected from the grcup consisting
of a polymer having the fo~low m g general formula, acid salts
thereof, and nixtures thereof:
L ~
~ ~ n
where:
Rl through R3 æ e hydrogen or an alkyl group having
from 1 to about 5 carbon atoms;
each Y is hydrogen, Z, CR4 ~ 0R6, CH2Cl, or an alkyl or
æ yl group having from 1 to 18 carbon aboms;
~ / Rg
Z is - C - N
R~ \ Rlo
R4 through Rlo æ e hydrogen, or an alkyl, aryl,
hydroxy-alkyl, anuu~-aLkyl, mercapto-alkyl or
phospho-aIkyl moiety, said R4 through Rlo being of
c æbon chain lengths up to a length at which the
compound is not soluble or dispersible; and
n is from 2 up to a number at which the polymer is not
soluble or dispersible.
i7746
The present invention also relates to preferred
treatment solutions oc~prising the above treatment ccmpound with
Z moieties being present. Preferably, the solution is an aqueous
solution and Z mDieties are present in sufficient amLunt that the
comp~und is water soluble or water dispersible.
A metal surfa oe contacted with a solution oomprising
the aforementioned treatment ccmpcund has enhanced corrosion
resistan oe and paint adhesion characteristics.
DEI~ILED DESCRIPqICN OF THE INVENTIoN
Although the solution of the invention can be
effectively applied to treated or untreated metal surfaces,
generally speaking the best results wilt be obtained if the metal
surfa oe has previously been conversion coated. CbnNersion
coatin~s æ e well knGwn and have been de Æ ibed, for exa~ple, in
Metal ~an~kcok, Volume II, 8th FA;tion, pages 529-547 of the
~merican Society for Metals and in Metal Finishing Guidebook and
Directory, pages 590-603 (1972).
In a typical metal treatment operation employing a
co~position and pro oe ss of this invention, the metal to be
treated is initially cleaned by a chemical or physical process
, . . .
1~i77~
and water rinsed to rem3ve grease and dirt from the surface. m e
metal surface is then brought into contact with the treatment
solution of this invention. Alternatively, instead of applying
the treatment solution following the cleaning process, a
conversion coating solution is applied to the metal surfa oe in a
oonventional D r to form a conversion coating thereon. The
conversion coated surfa oe is then water rinsed and the metal
surface is immediately brought into contact with the treatment
solution of the present invention.
The present invention is useful with a broad range of
metal surfa oe s, including metals having surfaces which have been
conversion coated with suitable conversion coatings such as iron
phosphate, manganese phosphate, zinc phosphate, zinc phosphate
mcdified with calcium, nickel, or magnesium ions, mixed metal
oxide, and titanium or zirconium organometallic coatings.
Examples of suitable metal surfa oe s include zinc, iron, aluminum
and cold-rolled, ground, pickled, and hot-rolled steel and
galvanized steel surfa oe s. As used herein, the term "metal
surface" includes kokh untreated metal surfaces and conversion
coated metal surfa oe s.
~i77~j
In accordance with the methcd of the present invention
a metal surface is treated by contacting the metal sur~a oe with a
solution ccmprising a treat~ent solution of the present
invention. The treatment solution cGmprises an ef.ective a unt
S of a soluble or dis~ersible treatment ccm¢ound selected frc~ a
polymer having the follcwing general formula, acid salts thereof
and mixtures thereof:
0}~ -
~Y
- F - F--
~ R2 n
whero:
Rl thrcugn R3 are hydrcgen or an alkvl grcu~ having
fl~u 1 to about 5 car on atcms;
each Y is hydrogen, Z, CR4R_OR6, CH2Cl, or an aIkyl or
aryl group having from 1 to 18 carcon atcms;
R7
Z is - C - N
R8 Rlo
R4 thrcugh Rlo are hydrcgen, or an aL~vl, a~l,
hydroxy-aIkyl, amino-alkyl, mercacto-aIkyl or
phospho-alkyl moiety, said R~ thrc w h ~ O being of
carbon chain lengths UD to a length at ~hich the
ccmpound is not soluble or dis~ersible; and
n is from 2 up to a number at which the polymer is not
soluble or dispersible ;
with the proviso that Rl, R2 and R3 cannot
simultaneously represent hydrogen when the substituted vinyl
group is para to the hydroxyl moiety.
- 6a -
.'' .v`
Preferably the treatment solution has Z moieties
present. Also preferably the treatment solution is an aqueous
solution and Z moieties æ e present in sufficient amaunt that the
compound is water soluble or water dispersible.
While the alkyl groups of the polymer backbone or chain
in the above formula can be located in the ortho, meta, or para
positions to the hydroxyl group on the aromatic ring of the
phen~l, monomer l~nits of the above general formula are preferably
selecbed from the para and ortho forms.
It will be appreciated that in the polymeric form, the
treatment oompound of the present invention can oomprise a
plurality of different specific monomer units each of the above
general formLla. For example, a poly~eric co~x~md of this
inNention can have the following general formula:
OH OH OH OH
Y~ YY~ Y
H (CH--CH2)A--(CH-CH2)B (CH-CH2)C (CH-CH2)D H
where Y is defined as above (but is not hydrogen) and wherein A,
B, C, and D can be from 0 to a number at which the polymer is not
soluble or dispersible in the solvent under the conditions of
use. A + B + C + D must be at least 2 and if the water is the
solvent then the methylene amine moiety, the Z moiety as defined
above, must be present in sufficient amount so that when
neutralized with an acid, the polymer is water soluble or water
dispersible. The particular amount as a mDlar percent needed for
water solubility or dispersibility depends upon the molecular
weight of the polymers as well as the particular R4 through Rlo
7~
moieties in the polymer. Generally speaking, the molar percent
of amino group or Z per phenolic group may vary from 10~ to 200~
and is usually 50~ to 150~; there being one phenolic group per
mancmer.
It will, of course, be appreciated that the treatment
compound of the present invention is based on derivatives of
poly-aLkenylphenol polymer. Examples of poly-aLkenylphenols or
substituted alkenylphenols useful in the present invention
include isopropenylphenol, isobutenylphenol, dimethylvinylphenol
and the like. Suitable derivatives having the above general
for~Lla can be made, for example, by the Mannich Reaction. For
example, a poly-4-vinylphenol polymer can be reacted with
formaldehyde and a secondary amine to yield a product which can
be neutralized with an organic or inorganic acid to yield a water
soluble or dispersible solution or emulsion of the treatment
compound of this invention.
The molecular weight of the poly-alkenylphenol used in
the preparation of derivatives claimed in the present invention
can range from the dimer, or more usually low moleclllar weight
oligomers of 360 ~o high molecular weight polymers of 30,000 or
greater. The upper limit of molecular weight being determined by
the functional limitation that the derivative therefrom be
soluble or dispersible.
The resulting derivatives of the formula set forth
hen~o~=~x~ve will typically have a molecular weight of up to about
200,000, with molecular weights within the range of about 700 to
about 70,000 being preferred. In the formula given for the æ
derivatives, a typical upper value for "n" is about 850, with
values of frcm about 10 to 300 being preferred. Similarly, the
carbon chain lengths of the R4 through Rlo substituents will
typically be from about l to 18, with carbon chain lengths of
fram about 1 to 12 being preferred. It will, of course, be
appreciated, that in each instance, a value for "n" and for the
carbon lengths, as well as the percent of the "Z" moiety, will be
selected which will provide the desired amount of solubility
and/or dispersibility.
The treatment comFounds of this invention are soluble
in organic solvents and can be used as a treatment solution when
dissolved in an organic solvent as, for example, ethanol.
A~vantageously, however, the treatment coaQcunds can also be used
in aqueous solution. To provide water solubility or water
dispersibility of the comFound, an organic or inorganic acid can
be used for neutralization of the "Z" moiety thereof. Useful
acids for this purpose are acetic acid, citric acid, oxalic acid,
ascorbic acid, phenylphosphonic acid, chloromethylphosphonic
acid; mono, di and trichloroacetic acid, trifluoroacetic acid,
nitric acid, phosphoric acid, hydrofluoric acid, sulfuric acid,
boric acid, hydrochloric acid, hexafluorosilicic acid, hexa-
fluonotitanic acid, hexafluorozirconic acid, and the like; alone
or in oombination with each other. The addition of water to the
neutralized, overneutralized or partially neutralized treatment
ccmpcunds ~2ntioned above results in a water soluble or
dispersible solution or emulsion of the polymer useful for metal
treatment.
The pH of the aqueous solution can vary from pH 0.5 to
12, but for practical purposes is usually kept between 2.0 to 8.0
., 9
7 L~ ~ j
both for the stability of the solution and for best results on
the treated metal Æ face.
It is contemplated that the treatment compound of the
present invention will generally be used in a working solution at
a dilute concentration of, for example, fram about 0.01% to about
5% by weigh~. Practically speaking, a concentration of 0.025~ to
1% is preferred in a working solution. However, under same
circumstan oe s, for example, for transporting or storing the
solution, a oancentrate of the solution may be preferred. Also,
it is o~ntemplated that the treatment solution may camprise a
pigment i.e., be a paint oamposition having a film forming
component which can be the treatment conçx~md itself, a solvent,
and an organic or inorganic pigment.
Of course, the treatment solution of the present
inNention can also camprise ingredients in addition to the
treatment 03mpound. For example, the treabment solution may
optionally camprise, in addition to the treatment compound, fram
about 0.001% to about 1.0~ of a metal ion selected fram the group
consisting of titanium, ~irconium and hafnium ions and mixtures
thereof. It will be appreciated that these ions are of Group rv
B transition metals of the Periodic Table of the Elements and may
be provided in aqueous solution by the addition of their water
soluble acids or salts, for example, hexafluorotitanic acid,
hexafluorozirconic acid, hexafluorohafnic acid, or the nitrate,
sulfate, fluoride, a oe tate, citrate, and/or chloride salts. Use
of such additianal metal ions can impn~ve both the effectiveness
or performance of the treatment solution in use and also can
reiluce the time of application of treatment solution to the metal
~t.7~
surface to as short a time as from about 2 to about 5 seconds, as
may be required for use on a coil line.
Still other optional ingredients may be employed in
addition to, or instead of, the aforementioned metal ions. For
example, in addition to the treatment compound and a metal ic,n
selected fram this group consisting of titanium, zirconium, and
hafnium ions and mixtures thereof, the treatment solution can
comprise from about 0.01% to about 4.0% of ingredients selected
f m m the gr~up consisting of thiourea, aIkyl or aryl thiourea
compo~nds, tannic acid, vegetable tannins or gall tannins and
mixtures thereof. Examples of suitable ingredients include
methyl, ethyl or butyl thiourea, wattle, mangrove or chestnut
tannins, oak gall tan m n, and valonea acorn cup extract.
Application of the treatment solution of the present
invention in the treatment step to a metal surface can be carried
out by any oonventional method. While it is contemplated that
the metal surface will preferably be a conversion coated metal
sur~ace, the treatment step can alternatively be carried out on
an untreated metal surface to improve the corrosion resistance
and paint adhesion thereof. For example, the treatment solution
can be applied by spray coating, roller coating, or dipping. The
temperature of the solution applied can vary over a wide range,
but is preferably from 70F to 160F. After application of the
treatment solution to the metal surfa oe , the surface can
optionally be rinsed, although good results can be obtained
without rinsing after treatment. For some end uses, for example,
in elect~xooat paint application, rinsing may be preferred.
11
1~i7746
Next, the treated ~etal surface is dried. Drying can
be carried out by, for example, circulating air or oven drying.
While room temperature drying can be employed, it is preferable
to use elevated temperatures to decrease the amount of drying
time required.
After drying, the treated metal Æ face is then ready
for painting or the like. The surface is suitable for standard
paint or other coating application techniques such as brush
painting, spray painting, electro-static coating, dipping, roller
coating, as well as elec~xooating. As a result of the treatm~ent
step of the present invention, the conversion coated surface has
i~pxoved paint adhesion and corrosion resistance characteristics.
Further understanding of the present invention can be had from
the following illustrative examples.
EX~D~LE 1
100 Ibs. of 95% ethanol solvent was charged into a lO0
gallon stainless steel reactor con~aining a turbine blade,
niLLuyen sparge and condenser. Gentle heating to 50C was
started, and 80 Ibs. of poly-4-vinylphenol polymer of a molecular
weight of 5000 was slowly added to the solvent with gcod
stirring. After all of the polymer was added, the reactor was
closed and heated to 80C to aid in dissolving the remaining
polymer. The reactor was then ccoled to 40C and 50 lbs. of
N-~ethylaminoethanol and lO0 lbs. of deionized water were àdded.
men over one (l) hour 54.1 lbs. of 37~ formaldehyde solution was
added while maintaining the temperature at 40C to ~2C. The
reactor was then heated for 3 hours at 40C and 315 lbs. of 10%
nitric acid was added and diluted to 10% solids with deionized
water to yield a stable solution of a treatment compound of the
present invention in water.
EXAMPLE 2
100 g. of CELL~CLVE* solvent was charged into a reactor
which was a 1000 ml reaction flask equipped with a condenser,
nitrogen sparge, overhead mechanical stirrer and thermcmeter.
Then 80 gm of poly-4-vinylphenol having a molecular weight of
5000 was added and dissolved. 70 gm of diethanolamine and 100 gm
of deionized water were added and reaction heated to 50C. 108 gm
of 37% formaldehyde solution was added over 1 hour and heated an
additional 3 hours at 50C and then 3 hours at 80C. The
reaction was cooled and 65 gm of 75~ phosphoric acid and then 227
gm of deionized water were added. m e product gave a stable
solution of a treatment compound of the present invention in
water.
E~iD~LE 3
A cold m lled steel 24 gauge panel which had been oiled
to prevent corrosion in shipping was cleaned with mineral oil and
then further cleaned using an aqueous solution of a strong
alkaline cleaner (sold under the trademark PAROO~ Cleaner 338 by
PARKER ~u~FACE T~U~CnY~Nr PRSDUCTS, OCCIDENI~L CHEMICAL OORP.) by
a spray application at 150F solution temperature for 60 seconds;
* Trademark
13
.~
i'7~
follcwed by the application of an iron phosphate conversion
coating ~sold under the trademark BONDERITE~ 1014 by PA~aCER
SURFALE T~EAIMENT PF~XXX~rS, CCCIDENTAL CHEMICAL OO~P.) for 60
seconds at 110F. After the con~ersion coating treatment, the
panels were rinsed with cold tap water for 30 seconds and then
treated with a .5% solution of the oompound of Example I for 30
seconds at a 110F solution temperature by a spray application.
The panels were then rinsed and dried in an oven at 350F for 5
minutes.
m e panels were painted with a standard Duracron~ 200
paint (from PPG Industries) and tested by the standard salt spray
method. (A$TMo B~117-61.) After 504 hours, the panels treated
with Example I as described above gave results equivalent to the
standard chromium treated control panels.
E~D~LE 4
The procedure of EKample 1 was carried out except that
after adding 54.1 lbs. of 37% ~ormaldehyde solution, the reaction
was then heated for 3 hours at 80C and 326 lbs. of 10%
phosphoric acid was added and the reactor contents were diluted
to 10% solids with deionized water to yield a stable solution of
a treatment oompound of the present invention in water.
E~D~LE 5
Cold rolled steel panels were cleaned using a strong
alkaline cleaner and the cleaned metal surface was then rinsed
14
74~
with hot ~ater. An iron phosphate conversion coating IBONDERITE~
1000 made by PARKER SURF~CE 5E~nq~NT PRODUCTS, OCCIDENTAL
CHEMICAL CORP.) was then applied at 160F by spray application
and the panels were r m sed with cold water ~efore application of
the post-treatment. Dilute solutions of the poly-4-vinylphenol
derivatives prepared as in Example 4 were mixed with
hexafluorotitanic acid and applied to the phosphated metal at
120F. Concentration of the poly-4-vinylphenol derivative and
hexafluorotitanic acid content was varied from .05 to .2~ and .06
to .03~ respectively. Some of the post-treated panels were water
rinsed others were not rinsed. All panels were then baked in a
350F oven for S minutes. Control panels of PA*~OLENE~ 60
chromium rinse were employed.
The abcve prepared panels were painted with an anodic
electrocoat paint system, Powercron~ 300 acrylic electrocoat of
PPC Industriesj at lZ0-140 volts for 60-90 seconds at 80F in
order to obtain a uniform coatihg appearance and thickness of
.95-1.00 mils. Cure of the coating was at 325F peak metal
temperature for 20 minutes. The panels ~ere scribed fru~ corner
to corner with an X using a sharp knife and all the way to the
bare metal. The panels were subjected to standard salt fog tests
in accordance with P~ B117-61 and ccmpared with chromate
treated as well as deionized rinsed controls. Results ~quivalent
to PAR30LENE~ 60 activated chromium rinse control (made by PAFKER
SURFACE I}Q~:q:~T PRCCUCTS, OCCIDENTAL CHEMICAL CORP.) were
obtained with the poly-4-vinylphenol derivative of .1%
concentration with hexafluorotitanic acid at .03% concentration
in the treatment bath.
77't~i
or complex oxide type. 5a~ples of the substrates prepared as
- described abcve were then given a 10 second final rinse wqth one
of the follcwinq final rinses:
Final Rinse No. 1. Mbdified chrcmic acid (Parcolenec 62 made by
PA~UCER SURFACE I~E~ Yr PRCDUCT5, occmENTAL
CHEMICAL CORP.)
Final Rinse No. 2. Deionized water.
FLnal Rinse No. 3. Aquecus solution of 0.25% by weight of an
acid salt of a poly-4-vinylphenol derivative,
pH 6.0 prepared as in E~ample 4.
Final Rinse No. 4. ~queous solution of 0.25~ by weight of the
acid salt of poly-4-vi.~ylphenol derivative as
in number 3 above and 0.015% by weight of
titaniu~ ions, added as H2TiF6, pH 6.1.
m e panels were then painted with one and two-coat
paint systf3ns:
Paint 1 GLIDDEN 71308* POLYLURE 2000
white polyester
Paint 2 M & T* black vinyl
Paint 3 MIDLAND* white polyester
Paint 4 MIDLAND-DE~ZR* 9x165 epoxy primer
MIDLI~ND-DE~rER 5x121 crystal white
Dexsta~ polyester topcoat
The panels were then scribed and subje~ted to standard ASTM
B-117-61 5% sait fog tests, ASTM 2247-64T humidity tests and 180
T-bend adhesion test as described in 2~rM D3794-79. m e results
are set forth below:
* Trademark
, 16
- : .
~77~i
T-bend adhesion test as described in ASTM D3794-79. The results
are set forth below:
5% Salt Fog Results
Final Iron Phosphate Zinc Phosphate Cbmplex Qxide
RLnse Paint 1 Paint 2 Paint 3 Paint 4 Paint 3 Paint 4
No. 192 Hr. 192 Hr. 504 Hr. 1008 Hr. 504 Hr. 1008 Hr.
1 1-14S 0-1 FM9 R9 0-1 VF~8 0-375 55%P MD6 0-1
1 O_ls O_lS FM9 R8.5 0-1 VF+8 o_l3s 55~p MD6 0-1
2 70% P 0_1S D9 R5 3-911sF8 2-575 85%P(192Hr.) 7-1214SVF+8
2 70% P N D9 R5 4-811SF6 2_48s 80%P(192Hr.) 40%P
3 1-2 0 15 D9 R5 1-235MD9 1-2 1 36s MD6 0-1 F9
3 1-1 O_ls D9 R6 1-255MDg 1_24s 4-13~D6 2%P 0-12sVF+9
4 2-3 N D8 R5 0_1S MD9 0-125 0-1 MD8 0 lsVF9
4 2_34s 0 ls D9 R5 0-15 MDg 0-1 0-1 ND9 0 14svF+9
VF = very few, F = few, FM = few-~edium, MD = medium-dense, D =
dense, %P = % peel, R = red rust, s = spot, N = nil.
Reported above is the creepback from the scribe, the
a~ount of blistering, and red rust ratings. The creepback from
the scribe produced by the final rinses containing the polymer is
substantially less than that of the deionized water final rinse.
With the added titanium, the creepback fro~ the scribe with the
polymer rinse is less than that of the chrcmic acid rinse in at
least four out of the six cases.
The humidity results for the iron phosphate coated
panels rinsed as above were essentially equivalent. ~he adhesion
at a 180 T-bend for the polymer-containing rinses was at least
equal to that for the chromic acid rinse, and generally better.
77~
EXAMPLE 7
Panels were treated as in Example 6, except that the
treat~ent time was reduced to 5 seconds. Excellent results as
CQn~XL~ed to chramic acid post-treatments were obtained on zinc
S phosphate and complex metal oxide conversion coatings but
slightly weaker results were obtained on iron phosphate when a
solution of poly-4-vinylphenol derivative prepared as in Example
4 was used at .1% con~entration along with .02% hexafluorotitanic
acid at a treatment bath pH of 5.1. Improved corrosion
resistance resulted by doubling the concentration in the
treatment bath of the poly-4-vinylphenol derivative and
hexafluorotitanic acid, as well as incorporation of .2% thiourea
and .05% tannic acid in the abcve formulation.
E5~D~LE 8
Cleaned aluminum panels were treated with BoNDEFITE~
787 treatment (a chrome-free conversion coating of PARKER SURFA OE
TRS~Y~DENT PR~DUCTS, CCCIDENTAL CHEMICAL CORP.) After rinsing
with cold water one set of panels was rinsed with PARCOLENE~ 88
(a ch m me~free rinse from PAE~CER SURFACE TREa~MENT PRODUCIS,
CCCIDENI~L CHEMICAL CORP.) and the other set was rinsed with a
post-treatment as prepared in Example 4.
After rinsing the panels were run through squeegee
rolls to remGve excess solution. Ch m me controls were prepared
using BONDERITEo 722 treatment and a final PARCOLENE~ 10 rinse
(both fram PARKER SURFA OE I$~.~nUENT PRODUCTS, OCCIDENTAL
CHEMICAL CORP.) After the PARfOLENE~ 10 rinse, the panels were
also run through squeegee rolls.
18
~ ~ ~ i 7 7 L~
The treated panels were painted with t~o single coat
systems.
1. HANNA* Paint- Hichory Brcwn Polyester XR8298D
2. W PONT* Paint- White acrylic 884-5001 LUCITE 2100
S Series
The painted aluminum panels ~æ_e subjected to acetic
acid salt spray for 504 hours. Ratings w-ere m2ce after e~ch 16a
hours ky tape plllling at the scribed area and obse_ving for loss
of paint, 'general blistering and edge creeDage.' Ihe follcwing
10 ratings were obselved after 504 hours:
3787
Poly-4-Vinyl-
~787 phenol Derivatives B722
Treatment +P~N 88 as in Ex2mDle 4 +PLN 10
. . _ , .
HANNA Paint E D6, D8 ` E 0-15, D9 ~ 0-15
S 7-10, D6 S o 2s D9 5 0-2
5% P D8 0-15 F9 0_1S F9
DVPONT Paint E D6 E MD9, D9 0_3s
20S 0-2 , 3%P, D6 S 0-1, MD9 S 0-2, l~P, VF99
0-25, 4~P, D6 1%P M9 O-ls, 3%P, VF'
E --Edge Rating, S = Scribe Rating
The ,salt spray results as measured by cre~page frcm the
scribe and bl;stering indicate that aluminum par.els treated with
BCND~x1'1~:3 787 treat~ent and Fost-treated with poly-4-vinylphenol
derivative of Example 4 is as good as or etter than BCNDE~ITE~
722 treatmen~ plus PARCOLENE~ 10 control systOEn.
* Trademark
19
7~
B~LE 9
Panels were treated as in Example 5 except each panel
was given a 5 second final rinse with one of the solutions below:
PARCC-
LENE~ 62
Poly-4- Mcdified
Final VinylPhenol Chrcmic
Rinse Derivative H Ti F6 Thiourea Tannic Acid Acid
No. Wt.~ t.% Wt.~ Wt.~ Wt.% ~
l 0.4 2.9
2 0.1 0.02 5.1
3 0.2 0.04 0.2 0.05 3.6
The panels were painted and tested as abcve. The
results with Rinse No. 2 were better than or equal to those with
Rinse No. l, the chramic acid control, except with the iron
phosphate system, where the results were good, but somewhat
weaker than with the chrQmic acid control. m e results with
Rinse No. 3 were better than or equal to those with Rinse No. 2.
While the above disclosure sets forth and describes
various en~xx~nents of the present invention, the ~ sitions
and methods described are- intended to illustrate but not limit
the present invention, it being understood that the specific
emlxXl~nents described herein are subject to variation and
modification by one skilled in the art having benefit of the
foregoing disclosure. Therefore, it is intended that the sccpe
of the present invention is to be limited solely by the following
claims.
