Metal surface treatment and aqueous solution therefor
AssigneeKao Corporation
InventorsKenji Kodama, Yuzo Yamamoto
Life of this patent
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Abstract
A metal article is improved on its surface for the purpose of plating thereon by treatment with an additive of an anionic, cationic or amphoteric and water-soluble or water-self-dispersible organic polymer J, K or L. J is a polymer having an aromatic ring and OH group and a polar group. K is a polymer of hydroxystyrene having a polar group. L is a copolymer of hydroxystyrene having a polar group and a vinyl compound. The parted article is improved in corrosion resistance.
Claims6
A method for treating a surface of a metal article comprising a step of contacting the surface of the metal article with an aqueous solution containing at least one metal ion and an additive of organic polymer (L);
- wherein polymer (L) is a hydroxystyrene having formula (L):
- ##STR61## wherein m>0 and n1.ltoreq.3 and each is a number necessary for said organic polymer represented by the general formula (L) to have a weight average molecular weight up to 1,000,000;
- k1 is a number from 0 to 2;
- p is a number from 0 to 2;
- R.sup.1 to R.sup.3 is each H or an alkyl group having 1 to 5 carbon atoms;
- X.sub.1 is a polymerizable vinyl monomer;
- Y.sub.1 and Z.sub.1, which may be the same or different, are each selected from among ##STR62## alkyl groups each having 1 to 18 carbon atoms and aryl groups, wherein M is H, an alkali, an alkali earth metal, or an organic cation of an amine;
- Y.sup.1 and Y.sup.4 is each a halogen;
- Y.sup.2- and Y.sup.3- is each a counter ion;
- W is S or O;
- R.sup.4, R.sup.5 and R.sup.8, which may be the same or different, is each a straight-chain or branched alkyl group, an alkyl group derivative such as a hydroxyalkyl group, an aromatic group, or H;
- R.sup.6 and R.sup.7, which may be the same or different, is each a straight-chain or branched alkyl group, an alkyl groyp derivative such as a hydroxyalkyl group, an aromatic group, H, or together form a heterocyclic group with the nitrogen atom;
- R.sup.9 to R.sup.15, which may be the same or different, are each a straight-chain or branched alkyl group, an alkyl group derivative, an aromatic group, or H;
- q, s and t is each 0 or 1;
- and
- r is 0, 1 or 2.
An aqueous solution containing at least one metal ion and an additive of organic polymer (L);
- wherein polymer L is a hydroxystyrene having formula (L):
- ##STR63## wherein m>0 and n1.gtoreq.3 and each is a number necessary for said organic polymer represented by the general formula (L) to have a weight average molecular weight up to 1,000,000;
- k1 is a number from 0 to 2;
- p is a number from 0 to 2;
- R.sup.1 to R.sup.3 is each H or an alkyl group having 1 to 5 carbon atoms;
- X.sub.1 is a polymerizable vinyl monomer;
- Y.sub.1 and Z.sub.1, which may be the same or different, are each selected from among ##STR64## alkyl groups each having 1 to 18 carbon atoms and aryl groups, wherein M is H, an alkali, an alkali earth metal, or an organic cation of an amine;
- Y.sup.1 and Y.sup.4 is each a halogen;
- Y.sup.2- and Y.sup.3- is each a counter ion;
- W is S or O;
- R.sup.4, R.sup.5 and R.sup.8, which may be the same or different, is each a straight-chain or branched alkyl group, an alkyl group derivative such as a hydroxyalkyl group, an aromatic group, or H;
- R.sup.6 and R.sup.7, which may be the same or differnent, is each a straight-chain or branched alkyl group, an alkyl group derivative such as a hydroxyalkyl group, an aromatic group, H, or together form a heterocyclic group with the nitrogen atom;
- R.sup.9 to R.sup.15, which may be the same or different, is each a straight-chain or branched alkyl group, an alkyl group derivative, an aromatic group, or H;
- q, s and t is each as 0 or 1;
- and
- r is 0, 1 or 2.
Dependencies are inferred from the claim text.