CA1131003A - Compositions for treating aluminum surfaces for tarnish resistance - Google Patents
Compositions for treating aluminum surfaces for tarnish resistanceInfo
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- CA1131003A CA1131003A CA350,712A CA350712A CA1131003A CA 1131003 A CA1131003 A CA 1131003A CA 350712 A CA350712 A CA 350712A CA 1131003 A CA1131003 A CA 1131003A
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Abstract
ABSTRACT
The subject invention relates to compositions of matter for treating aluminum surfaces for rendering them tarnish and corro-sive resistant. The compositions comprise an alkali metal sili-cate including sodium and potassium and lithium silicates and a soluble organic polymer having displaceable hydrogens or displaced hydrogens. The organic polymers having displaceable hydrogens may be derived from hydroxyls, carboxylic acids, amides, sulfonic acids, carbohydrates, and phosphoric acids. The composition may be readily applied by spraying or dipping them in concentration less than about 5% in an aqueous system.
The subject invention relates to compositions of matter for treating aluminum surfaces for rendering them tarnish and corro-sive resistant. The compositions comprise an alkali metal sili-cate including sodium and potassium and lithium silicates and a soluble organic polymer having displaceable hydrogens or displaced hydrogens. The organic polymers having displaceable hydrogens may be derived from hydroxyls, carboxylic acids, amides, sulfonic acids, carbohydrates, and phosphoric acids. The composition may be readily applied by spraying or dipping them in concentration less than about 5% in an aqueous system.
Description
`
~L~314~303 ,.
- COMPOSITIONS FOR TREATING ALUMINUM L
SURFACES FOR TARNISH RESISTANCE
Background of the Pr10r Art This invention relates to novel and useful improvements in 5 chemical compositions that impart tarnish and corrosion resistance to metal articles and, in particular, relates to compositions of matter~and methods for their application for treating aluminum ~
containers to render them stain and corrosion resistant. r As is known, when meta1 sur~aces are exposed to hot aqueous f 10 solutions, especially aluminum surfaces, for extended periods of time there is a marked tendency ~for such surfaces to tarnish to a brown or black coloration. Apparently, this coloration is a ~; ~ refractive effect of the~light as it passes throuyh amorphous ~ platelets of generally hydrated aluminum oxides that deposit and ~r;~ 15 build up on the sur~ace of the metal. This~problem becomes~acute in certain industries. For example, it has been the general prac-tice in breweries to pasteurize alcoholic bever~ages such as ale, , stout and beer in metal containers and this is generally done by subjecting the cans to hot water ba-ths or sprays in the range of 20 about 140F to about 170F. In subiecting metal containers to hot water there is a marked tendency for the metal surface, especially aluminum, to stain upon exposure and this is especially noted on the bottom portions of the containers. In practice, the severest problem of staining or discoloration is encountered during pas-25 teurizing of the package as no organic coating is applied to the container bottom to protect it from corrosion and if left untreated, it will discolor during pasteurization, turning brownish. While seemingly this effect does not harm the contents thereof, lt makes the product unappealing in its appearance to , - , . , , : . . i, , '' '' .' .. ' : ,~
",, . .
: . . .
3~3~L~03 the consumer. Heretofore it has been a practice in the art to apply a so-called conversion coating to metal containers in order to suppress or passivate such metal and to prevent tarnishing ~s well as to promote the adhesion of inner lacquers and outer coatings of ink, paints and the like.
Various corrosion inhibitors have been used commercially such as inorganic ions including chromates and phosphates and are referred to as conversion coatings.
Generally, the surface to be treated is subjected to an aqueous solution containing such ions. It is believed that these inorganic ions or heavy metal ions have the ability to bond or adhere in the form of insoluble oxides which resist tarnishing and corrosion of the metal surface. In general, the conversion coating solution is prepared and sprayed at some elevated temperature for a short period of time. After treating the metal surface with the solution, the surface is thoroughly rinsed with water to remove unreacted coating solution. However, in spite of the aclvantages of these corrosion inhibiting solutions, these inorganic ions have come under increasing scrutinization by environmental groups and governmental agencies with the result that there has been an increasing demand for compositions that do not have these detrimental heavy metal ions.
According to an aspect of the .invention there is provided a composition of matter consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of
~L~314~303 ,.
- COMPOSITIONS FOR TREATING ALUMINUM L
SURFACES FOR TARNISH RESISTANCE
Background of the Pr10r Art This invention relates to novel and useful improvements in 5 chemical compositions that impart tarnish and corrosion resistance to metal articles and, in particular, relates to compositions of matter~and methods for their application for treating aluminum ~
containers to render them stain and corrosion resistant. r As is known, when meta1 sur~aces are exposed to hot aqueous f 10 solutions, especially aluminum surfaces, for extended periods of time there is a marked tendency ~for such surfaces to tarnish to a brown or black coloration. Apparently, this coloration is a ~; ~ refractive effect of the~light as it passes throuyh amorphous ~ platelets of generally hydrated aluminum oxides that deposit and ~r;~ 15 build up on the sur~ace of the metal. This~problem becomes~acute in certain industries. For example, it has been the general prac-tice in breweries to pasteurize alcoholic bever~ages such as ale, , stout and beer in metal containers and this is generally done by subjecting the cans to hot water ba-ths or sprays in the range of 20 about 140F to about 170F. In subiecting metal containers to hot water there is a marked tendency for the metal surface, especially aluminum, to stain upon exposure and this is especially noted on the bottom portions of the containers. In practice, the severest problem of staining or discoloration is encountered during pas-25 teurizing of the package as no organic coating is applied to the container bottom to protect it from corrosion and if left untreated, it will discolor during pasteurization, turning brownish. While seemingly this effect does not harm the contents thereof, lt makes the product unappealing in its appearance to , - , . , , : . . i, , '' '' .' .. ' : ,~
",, . .
: . . .
3~3~L~03 the consumer. Heretofore it has been a practice in the art to apply a so-called conversion coating to metal containers in order to suppress or passivate such metal and to prevent tarnishing ~s well as to promote the adhesion of inner lacquers and outer coatings of ink, paints and the like.
Various corrosion inhibitors have been used commercially such as inorganic ions including chromates and phosphates and are referred to as conversion coatings.
Generally, the surface to be treated is subjected to an aqueous solution containing such ions. It is believed that these inorganic ions or heavy metal ions have the ability to bond or adhere in the form of insoluble oxides which resist tarnishing and corrosion of the metal surface. In general, the conversion coating solution is prepared and sprayed at some elevated temperature for a short period of time. After treating the metal surface with the solution, the surface is thoroughly rinsed with water to remove unreacted coating solution. However, in spite of the aclvantages of these corrosion inhibiting solutions, these inorganic ions have come under increasing scrutinization by environmental groups and governmental agencies with the result that there has been an increasing demand for compositions that do not have these detrimental heavy metal ions.
According to an aspect of the .invention there is provided a composition of matter consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of
2 ~
ch /~ . . .
: ,., ,;
' ~3~ )3 poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid),t~bs~r~e~ poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 90 to about 99.99 weight percent water.
According to a further aspect of the invention there is provided a method for treating aluminum with the above described composition.
According to a still further aspect of the invention there is provided an aluminum surface treated by the method of the invention.
Metal surfaces treated by the process of this invention remain stain and corrosion resistant over a long period of time and do not have to be further treated or coated.
Furthermore, the compositions herein clo not present toxic materials and do not have any disposal problems. Thus, the subject compositions are free of chromium ions and of the chromium subgroup of the Periodic Table and also materials such as ferricyanide and ferrocyanide.
Description of the Invention The particular group of silicates that have been found to be effective herein are those aqueous silicates such as sodium, ~h /I t^~.
r~
~3~ 3 potassium or lithium, or mixtures of such silicates. These sili-cates are known generally as water glasses and are usually aqueous solutions containing numerous varieties of alkali me-tal silicates, e.g., M20 SiO2; ~120-2SiO2; M20 3SiO2;
M20-~Sio2; M20 SSiO2 and may be represented generally as ~.Si - O ~-- ~
x.
( ) M
where M is sodium, potassium or li-thium and x is an integer, generally between l and lO~ ~.
In general these aqueous silicate solutions have a specific gravi-ty range from about l.3 to about l.6 and comprise about 23 to 15 about ~8 percent by weight of the alkali metal silicate.
EfFective silica to metal oxide weight ratios range from about l.87 to about lOØ
The useful polymers of the subject invention are organic, polymeric substances having displaceable or displaced hydrogens 20 and are generally derived by polymerization of at least one mono-ole~inic compound through an aliphatic unsaturated group to yield a water-soluble synthetic polymer having a strOucture substantially free of cross-linkage. In general, the polymers herein are those water-soluble polymers having a linear polymeric structure of car-25 bon or carbon with some other atom such as oxygen and contain in apendent side chain a hydrophilic group ~rom the class consisting of hydroxyl, carboxylic acids, carboxylic acid amides, sul-Fonic acids and phosphoric acids. It will be appreciated that in its broadest aspect the aforementioned polymers Fa1l into two classes, ~ IIL3~ 3 5~
~' (1) those consisting of polynleric organic substances which in an aqueous medium will form organic anions haviny a substantial num-ber of negative charges distributed at a mul-tiplicity of positions on the polymer, and (2) those consistiny oF polymeric organic sub-5 stances which in an aqueous medium will not form ions but nonethe-less contain a sufficient number of hydrophilic groups to be ~
water-soluble. The first class of polymers may be referred to as _ anionic organic polymers and the second class may be called non-ionic-organic polymers.
Very small concentrations of the ingredients herein defined have been found effecitve for improving the corrosion resistance.
The synthetic organic polymers containing only carboxylic acid, sulfonic acid, phosphoric acid, as well as the salts thereof in a side chain are anionic and those that contain hydroxy and carboxy- ~.
15 lic acid amide in the side chain are non-ionic. Natural carbohy-drates have been found effective herein and included the highly branched polymers of acacia gum. The invention herein contem-plates polymers that contain either the anionic or non-ionic groups as well as mixtures thereof.
The composition herein may be readily formulated in an aque-ous media. The oryanic and inorganic ingredients may be Mixed in any order into water. Preferably, the compositions are prepared by mixing the components in a given amount of water with constant stirring within ambient temperatures until the ingredients go 25 fully into solution. t The preferred range for both the alkali nletal silicates and P'-soluble polymers should be between about 0.05 and about 5 weight percent. At its most preferred embodiment a mixture of the alkali metal silicate and soluble polymer should be present at about 3 30 weight percent based on the total weight of the solution. Lower concentrations do not produce an appreciable improvement in cor-rosion characteristics, and higher concentrations do not increase these characteristics, generally, any further. To these compos;-tions may be readily added other various ingredients that are 35 compatible with the system. Such ingredients include wetting ~ L~I 3~L~r)3 agents, dyes, pigments and germac;des. The compositions herein described and claimed may be readily applied by various conven-tional means known to the art and including dipping, spraying, immersion, and roll-on techni~ues. It is believed that the compo-5 sitions herein can be readily applied most economically andeffectively by spraying.
The following tabulation gives Examples comprising composi-tions as defined herein that were prepared with the amount indi-cated in grams per liter for the ingredients. To each of 10 Examples 8-2U were added about 0.01 grams of a commercial wetting agent, Triton~X-100. Each formulation was placed in contact ~ith an aluminum coupon for about two (2j minutes, at the ternperature indicated and thereaFter rinsed and dried. The thus-treated coupons were thereafter submerged for fifteen (15) minutes at 15 about 75C., in a standard solution comprising an aqueous solution of 220 ppm NaHC03 and 83 ppm ,laCL. The processing conditions of temperature, contact time, and contact me-thod are interdependent.
In general, app1ication of the cornpositions herein is conventionally by spray technique and, considering normal plant operations, the 20 temperature of the solution will normally be from 30 to 90C., preferably about 35 to about 60C., and the contact time will be between about 1~ and 90 seconds and usually less than 70 seconds.
Two commercial formulations were also tested as indicated in the table. The ratings in the respective columns represent the amount 25 of discoloration for each example.
- It will be appreciated that is has been found in accordance with the present invention that aqueous coating solutions con-taining an alkali metal silicate and a water-soluble organic poly-mer of the anionic, non-ionic type or mixtures thereof are 30 effective in protecting aluminum surfaces. The corrosion resis-tant properties of the coating formed by applications of such solutions within the scope of the present invention include the
ch /~ . . .
: ,., ,;
' ~3~ )3 poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid),t~bs~r~e~ poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 90 to about 99.99 weight percent water.
According to a further aspect of the invention there is provided a method for treating aluminum with the above described composition.
According to a still further aspect of the invention there is provided an aluminum surface treated by the method of the invention.
Metal surfaces treated by the process of this invention remain stain and corrosion resistant over a long period of time and do not have to be further treated or coated.
Furthermore, the compositions herein clo not present toxic materials and do not have any disposal problems. Thus, the subject compositions are free of chromium ions and of the chromium subgroup of the Periodic Table and also materials such as ferricyanide and ferrocyanide.
Description of the Invention The particular group of silicates that have been found to be effective herein are those aqueous silicates such as sodium, ~h /I t^~.
r~
~3~ 3 potassium or lithium, or mixtures of such silicates. These sili-cates are known generally as water glasses and are usually aqueous solutions containing numerous varieties of alkali me-tal silicates, e.g., M20 SiO2; ~120-2SiO2; M20 3SiO2;
M20-~Sio2; M20 SSiO2 and may be represented generally as ~.Si - O ~-- ~
x.
( ) M
where M is sodium, potassium or li-thium and x is an integer, generally between l and lO~ ~.
In general these aqueous silicate solutions have a specific gravi-ty range from about l.3 to about l.6 and comprise about 23 to 15 about ~8 percent by weight of the alkali metal silicate.
EfFective silica to metal oxide weight ratios range from about l.87 to about lOØ
The useful polymers of the subject invention are organic, polymeric substances having displaceable or displaced hydrogens 20 and are generally derived by polymerization of at least one mono-ole~inic compound through an aliphatic unsaturated group to yield a water-soluble synthetic polymer having a strOucture substantially free of cross-linkage. In general, the polymers herein are those water-soluble polymers having a linear polymeric structure of car-25 bon or carbon with some other atom such as oxygen and contain in apendent side chain a hydrophilic group ~rom the class consisting of hydroxyl, carboxylic acids, carboxylic acid amides, sul-Fonic acids and phosphoric acids. It will be appreciated that in its broadest aspect the aforementioned polymers Fa1l into two classes, ~ IIL3~ 3 5~
~' (1) those consisting of polynleric organic substances which in an aqueous medium will form organic anions haviny a substantial num-ber of negative charges distributed at a mul-tiplicity of positions on the polymer, and (2) those consistiny oF polymeric organic sub-5 stances which in an aqueous medium will not form ions but nonethe-less contain a sufficient number of hydrophilic groups to be ~
water-soluble. The first class of polymers may be referred to as _ anionic organic polymers and the second class may be called non-ionic-organic polymers.
Very small concentrations of the ingredients herein defined have been found effecitve for improving the corrosion resistance.
The synthetic organic polymers containing only carboxylic acid, sulfonic acid, phosphoric acid, as well as the salts thereof in a side chain are anionic and those that contain hydroxy and carboxy- ~.
15 lic acid amide in the side chain are non-ionic. Natural carbohy-drates have been found effective herein and included the highly branched polymers of acacia gum. The invention herein contem-plates polymers that contain either the anionic or non-ionic groups as well as mixtures thereof.
The composition herein may be readily formulated in an aque-ous media. The oryanic and inorganic ingredients may be Mixed in any order into water. Preferably, the compositions are prepared by mixing the components in a given amount of water with constant stirring within ambient temperatures until the ingredients go 25 fully into solution. t The preferred range for both the alkali nletal silicates and P'-soluble polymers should be between about 0.05 and about 5 weight percent. At its most preferred embodiment a mixture of the alkali metal silicate and soluble polymer should be present at about 3 30 weight percent based on the total weight of the solution. Lower concentrations do not produce an appreciable improvement in cor-rosion characteristics, and higher concentrations do not increase these characteristics, generally, any further. To these compos;-tions may be readily added other various ingredients that are 35 compatible with the system. Such ingredients include wetting ~ L~I 3~L~r)3 agents, dyes, pigments and germac;des. The compositions herein described and claimed may be readily applied by various conven-tional means known to the art and including dipping, spraying, immersion, and roll-on techni~ues. It is believed that the compo-5 sitions herein can be readily applied most economically andeffectively by spraying.
The following tabulation gives Examples comprising composi-tions as defined herein that were prepared with the amount indi-cated in grams per liter for the ingredients. To each of 10 Examples 8-2U were added about 0.01 grams of a commercial wetting agent, Triton~X-100. Each formulation was placed in contact ~ith an aluminum coupon for about two (2j minutes, at the ternperature indicated and thereaFter rinsed and dried. The thus-treated coupons were thereafter submerged for fifteen (15) minutes at 15 about 75C., in a standard solution comprising an aqueous solution of 220 ppm NaHC03 and 83 ppm ,laCL. The processing conditions of temperature, contact time, and contact me-thod are interdependent.
In general, app1ication of the cornpositions herein is conventionally by spray technique and, considering normal plant operations, the 20 temperature of the solution will normally be from 30 to 90C., preferably about 35 to about 60C., and the contact time will be between about 1~ and 90 seconds and usually less than 70 seconds.
Two commercial formulations were also tested as indicated in the table. The ratings in the respective columns represent the amount 25 of discoloration for each example.
- It will be appreciated that is has been found in accordance with the present invention that aqueous coating solutions con-taining an alkali metal silicate and a water-soluble organic poly-mer of the anionic, non-ionic type or mixtures thereof are 30 effective in protecting aluminum surfaces. The corrosion resis-tant properties of the coating formed by applications of such solutions within the scope of the present invention include the
3 ~ 3 ability of the coating to withstand blackening or other discolor- r ation when subjected to boiling water for a period of time of at least two minutes or longer.
The particular compositions of the present invention can be 5 used to protect p~re aluminum or alloys of aluminum, for example, aluminum alloys containing minor amounts of metals such as, for example, magnesium, manganese, copper and silicon. Presently, two of the most common alloys used in the aluminum container industry are aluminum alloys 3003 and 3004.
After the coating compositions are applied the surfaces may be ~.
dried by conventional means such as an oven having forced circula- L
tion of hot air. After the coating has dried it can be readily subjected to lacquering or to decorative operations which can include applying to the surfaces inks, paints or other resin 15 coating. I~ith the methods and compositions of this invention very excellent adhesion of these decorative finishes is realized.
A large number of water-soluble polymers of both the anionic and non-ionic -type may be readily employed. Illustrative of the non-ionic polymers are poly(vinyl alcohol), poly(acrylamide) and a 20 number of organic polymeric coagulants of vegetable and cellulosic origin including Gum Arabic. Illustrative of the anionic types are poly(acrylic-co-acrylate)j poly(acrylic acid), poly(maleic anhydride-co-methylvinyl ether)g poly(styrene sulfonic acid), sodium poly(acrylate), sodium poly(methacrylate), poly(itaconic-25 co-vinyl acetate) and the like.
By poly(acrylic-co-acrylate) is meant those copolymers of acrylic acid, methacrylic acid, methyl m~thacrylate, methylacry-late and derivatives thereof.
: "
' !~ ' f ~
~3~3 g L
----- N ----= -------= ---_ _ _ N __ O
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tn ~ ~ V ~ ~
LLI~J ~a v t_ a o -o ' -O ~ t . . .
o ~v ~-~ ~a o o u tv t~ ~ tv ~v ~
~- -. ~ ~ t~ ~ a ~ ~ ~ tn ~ ~ ~ !-cr ~ ~a, ~ g ~ ~rJ ~ E ta ~ ~v a t~ ~a x .~ ~ . .t~ v LLJ . ~r~rv t--~ ~ r~ r- '~ > rv tr~ rJ7 C~
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, E -~ ~ a ~ a ~ ~ ~
rV E tn ~r- a ~ ,a ~ a E ~ v) t_ O ~ S v~ > E ~ E F V r . r- O O -- 1- Q QO O ,3 O QO QO ~ E v o__ - . i r- ~ f_~
~L33Lal~)3 There has been disclosed herein a method oF and a composition F
for treating aluminum metal surfaces, and in particular those metal surFaces that are subjected to hot water solutions and the like, especially in pasteurization processes for aluminum can bodies. I
5 In view of the specifications, those skilled in the art may have many modifications which fall within the true spirit and scope of this invention. It is intended that all such modifications be .
within the scope Of the app~nded ~la~m.
r .
i .
The particular compositions of the present invention can be 5 used to protect p~re aluminum or alloys of aluminum, for example, aluminum alloys containing minor amounts of metals such as, for example, magnesium, manganese, copper and silicon. Presently, two of the most common alloys used in the aluminum container industry are aluminum alloys 3003 and 3004.
After the coating compositions are applied the surfaces may be ~.
dried by conventional means such as an oven having forced circula- L
tion of hot air. After the coating has dried it can be readily subjected to lacquering or to decorative operations which can include applying to the surfaces inks, paints or other resin 15 coating. I~ith the methods and compositions of this invention very excellent adhesion of these decorative finishes is realized.
A large number of water-soluble polymers of both the anionic and non-ionic -type may be readily employed. Illustrative of the non-ionic polymers are poly(vinyl alcohol), poly(acrylamide) and a 20 number of organic polymeric coagulants of vegetable and cellulosic origin including Gum Arabic. Illustrative of the anionic types are poly(acrylic-co-acrylate)j poly(acrylic acid), poly(maleic anhydride-co-methylvinyl ether)g poly(styrene sulfonic acid), sodium poly(acrylate), sodium poly(methacrylate), poly(itaconic-25 co-vinyl acetate) and the like.
By poly(acrylic-co-acrylate) is meant those copolymers of acrylic acid, methacrylic acid, methyl m~thacrylate, methylacry-late and derivatives thereof.
: "
' !~ ' f ~
~3~3 g L
----- N ----= -------= ---_ _ _ N __ O
~ ~0r ~
tn ~ ~ V ~ ~
LLI~J ~a v t_ a o -o ' -O ~ t . . .
o ~v ~-~ ~a o o u tv t~ ~ tv ~v ~
~- -. ~ ~ t~ ~ a ~ ~ ~ tn ~ ~ ~ !-cr ~ ~a, ~ g ~ ~rJ ~ E ta ~ ~v a t~ ~a x .~ ~ . .t~ v LLJ . ~r~rv t--~ ~ r~ r- '~ > rv tr~ rJ7 C~
'~ '-- E rnt >, >, , ~ ,_ O o E~
, E -~ ~ a ~ a ~ ~ ~
rV E tn ~r- a ~ ,a ~ a E ~ v) t_ O ~ S v~ > E ~ E F V r . r- O O -- 1- Q QO O ,3 O QO QO ~ E v o__ - . i r- ~ f_~
~L33Lal~)3 There has been disclosed herein a method oF and a composition F
for treating aluminum metal surfaces, and in particular those metal surFaces that are subjected to hot water solutions and the like, especially in pasteurization processes for aluminum can bodies. I
5 In view of the specifications, those skilled in the art may have many modifications which fall within the true spirit and scope of this invention. It is intended that all such modifications be .
within the scope Of the app~nded ~la~m.
r .
i .
Claims (26)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A composition for resisting tarnish on aluminum surfaces during exposure to hot water baths, said composition comprising about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight per-cent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(,vinyl alcohol), poly(acrylic acid),poly(,acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid),and about 90 to about 99.99 weight percent water.
2. A composition as recited in Claim 1 wherein the composition comprises about 0.01 to about 5 weight percent of the water-soluble portion and about 95 to about 99.99 weight percent water.
3. A composition as recited in Claim 1, wherein the alkali metal silicate is present in an amount between about 60 and about 70 weight percent and the organic polymer is present in an amount between about 30 and about 40 weight percent.
4. A composition of matter consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 90 to about 99.99 weight percent water.
5. A composition of matter comprising about 0.01 to about 3 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate.
and about 5 to 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly-(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly-(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 97 to about 99.99 weight percent water.
and about 5 to 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly-(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly-(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 97 to about 99.99 weight percent water.
6. A composition of Claim 5 wherein the alkali metal silicate is sodium silicate.
7. A composition of Claim 6 wherein the water-soluble portion is about 0.6 weight percent.
8. A composition of matter consisting essentially of about 0.01 to about 3 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic-acid), and about 97 to about 99.99 weight percent water.
9. A composition as in Claim 8 wherein the alkali metal silicate is sodium silicate.
10. A composition as in Claim 8 wherein the water soluble portion is about 0.6 weight percent.
11. A method of treating an aluminum surface to impart tarnish resistance thereto by the-steps of contacting said surface with a solution comprising about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 90 to about 99.99 weight percent water and thereafter washing away said solution.
12. A method of treating an aluminum sur-face to impart tarnish resistance thereto by the steps of contacting for at least 10 seconds at a temperature of at least about 40°C, said aluminum surface with a composition comprising about 0.01 to about 10 weight percent of a water soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly-(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether) and poly(styrene sulfonic acid), and about 90 to 99.99 weight percent water, and thereafter rinsing said aluminum surface.
13. A method as recited in Claim 12 wherein the com-position comprises about 0.01 to about 5 weight percent of the water-soluble portion and about 95 to about 99.99 weight percent water.
14. A method as recited in Claim 12 wherein the alkali metal silicate is present in an amount between about 60 and about 70 weight percent and the organic polymer is present in an amount between about 30 to about 40 weight percent.
15. A method as recited in Claim 12 wherein the aluminum surface is contacted with the composition for about one minute.
16. A method as recited in Claim 12 wherein the aluminum surface is exposed to the composition at a temperature greater than about 60°C.
17. An aluminum surface having a coating thereon consisting essentially of an alkali metal silicate and an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid).
18. An aluminum surface of Claim 17 wherein said alkali metal silicate is selected from the group consisting of sodium silicate, potassium silicate and lithium silicate.
19. A tarnish resistant aluminum surface treated-by the process of contacting for at least 10 seconds at a temperature of at least about 40°C, said surface with a solution comprising about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(,vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid).
20. A method of treating an aluminum surface to impart tarnish resistance thereto by the steps of contacting said surface with a solution consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion con-taining about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate),poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide),poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid), and about 90 to about 99.99 weight percent water and thereafter washing away said solution.
21. A method of treating an aluminum surface to impart tarnish resistance thereto by the steps of contacting for at least 10 seconds at a temperature of at least about 40°C, said aluminum surface with a composition consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to about 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcoholl, poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether) and poly(styrene sulfonic acid), and about 90 to 99.99 weight percent water, and thereafter rinsing said aluminum surface.
22. A method as recited in Claim 21 wherein the com-position comprises about 0.01 to about 5 weight percent of the water-soluble portion and about 95 to about 99.99 weight per-cent water.
23. A method as recited in Claim 21 wherein the alkali metal silicate is present in an amount between about 60 and about 70 weight percent and the organic polymer is present in an amount between about 30 to about 40 weight percent.
24. A method as recited in Claim 21 wherein the aluminum surface is contacted with the composition for about one minute.
25. A method as recited in Claim 21 wherein the aluminum surface is exposed to the composition at a temperature greater than about 60°C.
26. A tarnish resistant aluminum surface treated by the process of contacting for at least 10 seconds at a temperature of at least about 40°C, said surface with a solution consisting essentially of about 0.01 to about 10 weight percent of a water-soluble portion containing about 10 to about 95 weight percent of an alkali metal silicate and about 5 to 90 weight percent of an organic polymer selected from the group consisting of poly(acrylic-co-acrylate), poly(vinyl alcohol), poly(acrylic acid), poly(acrylamide), poly(maleic anhydride-co-methylvinyl ether), and poly(styrene sulfonic acid).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA350,712A CA1131003A (en) | 1980-04-25 | 1980-04-25 | Compositions for treating aluminum surfaces for tarnish resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA350,712A CA1131003A (en) | 1980-04-25 | 1980-04-25 | Compositions for treating aluminum surfaces for tarnish resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131003A true CA1131003A (en) | 1982-09-07 |
Family
ID=4116789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA350,712A Expired CA1131003A (en) | 1980-04-25 | 1980-04-25 | Compositions for treating aluminum surfaces for tarnish resistance |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1131003A (en) |
-
1980
- 1980-04-25 CA CA350,712A patent/CA1131003A/en not_active Expired
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