KR870009055A - Stabilizing Compositions of Sn (II) Ions - Google Patents

Abstract

In acid Sn(II)-containing electrolytes for staining anodically produced oxide layers on aluminium or aluminium alloys or for electroplating, the Sn(II) becomes oxidised. Adding substances to the electrolyte, so called stabilisers, may prevent the oxidation to a greater or lesser degree, i.e. Sn(II) can be stabilised to a greater or lesser degree. The effectiveness of the stabiliser furthermore governs the quality of the deposits or the coloration of the anodised layer. The quality of the surface treatment is known to deteriorate in the presence of Sn(IV) in substantial amounts alongside Sn(II) as a consequence of inadequate stabilisation of the Sn(II). An acid Sn(II)-containing electrolyte with a soluble diphenylamine or substituted diphenylamine derivative added stabilises the Sn(II) and yields faultless colorations.

Description

Stabilizing Compositions of Sn (II) Ions

Since this is an open matter, no full text was included.

1 shows the results of test 1.

2 shows the results of test 2.

Claims (14)

A diphenylamine or substituted diphenylamine derivative or a mixture thereof as an active ingredient, wherein the active ingredient is dissolved in an acidic medium. The composition according to claim 1, wherein the active ingredient is a compound of formula (I). At this time Each of the substituents R ₁ to R ₁₀ is each hydrogen; Halogen (at most one for each ring); Nitro (at most one for each ring); -COOM (at most two for each ring); -SO ₃ M (up to two for each ring); -NH ₂ (up to two for each ring); C _1-4 alkyl; phenylamino (at most one for each ring); R ₁₁ is hydrogen; C _1-4 alkyl; β-to ω-hydroxy-C _1-4 alkyl; phenyl; or-(-BO-) | _n -R _{12 where} B is -C ₂ H ₄ -,-C ₃ H ₆ -or -C ₄ H _8- , n is from 1 to 20 and R ₁₂ is H, -SO ₃ M or -CH ₂ COOM being), M is oxygen or cationic. The method according to claim 1 or 2, wherein the active ingredient 2-amino-diphenylamine 4-amino-diphenylamine 4-Amino-diphenylamine-2-carboxylic acid Diphenylamine-4-sulfonic acid 2-Amino-diphenylamine-4-sulfonic acid 4-Amino-diphenylamine-2-sulfonic acid 4,4'-diamino-diphenylamine-2-sulfonic acid 4'-amino-nitrodiphenylamine-2-sulfonic acid With 1-amino-2,4-di (phenylamino) benzene-5-sulfonic acid And diphenylamine-4,4'-disulfonic acid and mixtures thereof. 4. A composition according to claim 3, wherein the active ingredient is a mixture of diphenylamine-monosulfonic acid and diphenylamine-disulfonic acid. The composition according to any one of the preceding claims, which also contains tin (II) -electrolyte. 6. The composition of claim 5, wherein the tin (II) -electrolyte is tin sulfate. 7. A composition according to claim 5 or 6, having an acidic pH. 8. A composition according to claim 6 or 7, which contains sulfuric acid. 9. A composition according to any one of claims 5, 6, 7, or 8, characterized in that the ratio of tin (II) -electrolyte to the active ingredient is 2-30: 0.02-1. An acidic tin (II) -electrolyte bath containing a soluble dipeanylamine or substituted diphenylamine derivative or mixture thereof as defined in claims 1-4. The acidic tin (II) -electrolyte bath according to claim 10, wherein the weight ratio of tin (II) -electrolyte to diphenylamine or diphenylamine derivative is 2-30: 0.02-1. A method of stabilizing an acidic tin (II) -electrolyte characterized by contacting an electrolyte with an effective amount of soluble diphenylamine or substituted diphenylamine derivatives or mixtures thereof to prevent oxidation of Sn (II) -ions. . A method of coloring or electroplating an oxide layer on an aluminum or aluminum alloy stabilized by Sn (II) -electrolytic soluble diphenylamine or substituted diphenylamine derivatives or mixtures thereof and anodized with Sn (II) containing electrolyte. The method according to claim 12 or 13, wherein diphenylamine or diphenylamine derivative is used as tin (II) -electrolyte bath of 20 mg / 1 to 1 g / 1. ※ Note: The disclosure is based on the initial application.