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Electroplating solution composition for organic polymer-zinc alloy composite plating and plated metal material using such composition

a technology of organic polymer and zinc alloy, applied in the direction of electrolytic coatings, coatings, etc., can solve the problems of chromium toxicity, large cost of waste water treatment facilities, and extremely toxic substances, and achieve excellent adhesiveness and corrosion resistance. excellent

Inactive Publication Date: 2007-07-26
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] An object of the invention is to provide an electroplating solution composition capable of obtaining a plated film excellent in adhesiveness to a coating film without surface treatment and excellent in corrosion resistance.
[0010] As a result of extensive studies for solving the above-described problems, the present inventors have found that corrosion resistance of a plated film is remarkably improved by incorporating an iron-group-element ion and W ion into an organic polymer composite zinc alloy electroplating solution containing Zn ion and a water-soluble and / or water-dispersible organic polymer, and they have accomplished the invention.

Problems solved by technology

As surface treatment of zinc-based plated metal materials for use in automobiles, home electric appliances, building materials, and the like, treatment with a chromate salt and treatment with zinc phosphate are generally conducted but toxicity of chromium has been regarded as a problem.
The treatment with a chromium salt has problems that fumes of the chromate salt emit during the treating step, a large cost is required for waste water-treating facility, and chromic acid is eluted out of chemical conversion films.
Further, hexavalent chromium compounds are assigned as carcinogenic substances for human by many public institutions including IARC (international Agency for Research on Cancer Review) as a representative and are extremely toxic substances.
Additionally, in the treatment with zinc phosphate, since rinse treatment with chromic acid is usually conducted after the treatment with zinc phosphate, there arise a problem of chromium treatment and also problems of waste water treatment for a reaction accelerator, metal ions, and the like in a zinc phosphate treating agent and sludge treatment due to elution of metal ions from metals to be treated.
However, a sufficient corrosion resistance is not obtained by mere addition of a water-soluble organic polymer into a general plating bath and it is difficult to apply the methods to fields wherein a severe corrosion resistance is required, e.g., automobile field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0072] The present invention will be illustrated in greater detail with reference to the following Examples. In this connection, the “part(s)” and “%” used below are all given by weight.

“1. Preparation of Plating Solution and Manufacture of Electroplated Metal Material”

examples 76 to 82

[0171] A steel bolt was subjected to alkali degreasing and washed with water and then it was dipped in a 1% sulfuric acid solution at room temperature for 30 seconds to effect activation treatment. Thereafter, using a batch-type barrel plating apparatus, plating was conducted in an alkaline plating bath containing predetermined metal ions, a corrosion-inhibiting pigment, a corrosion-inhibiting organic compound, and ceramic particles shown in Table 7. The composition of the film was regulated by changing the concentration ratio of the metal ions in the plating bath, current density, and bath temperature and plated film thickness was controlled by suitably choosing a plating time. Then, post treatment was carried out by dipping it in an acidic aqueous solution comprising 5 g / l of HNO3 and 15 g / l of (NH4)2ZrF6, whereby a bolt for test was manufactured.

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Abstract

An object of the invention is to provide an electroplating solution composition capable of obtaining a plated film excellent in adhesiveness to a coated film and excellent in corrosion resistance without surface treatment. The present invention relates to an organic polymer composite zinc alloy electroplating solution composition containing: (A) 1 to 600 g / l of Zn ion, (B) 1 to 600 g / l of an iron-group-element ion, and (C) 0.1 to 200 g / l, in terms of W ion, of tungstic acid-based compound, and (D) 0.5 to 500 g / l of water-soluble or water-dispersible organic polymer compound having a number average molecular weight of 1,000 to 1,000,000.

Description

TECHNICAL FIELD [0001] The present invention relates to an organic polymer composite zinc alloy electroplating solution composition for forming an electroplated film having both roles of plating and surface treatment and also to an organic polymer composite zinc alloy electroplated metal material obtainable by electroplating using the composition. BACKGROUND ART [0002] As surface treatment of zinc-based plated metal materials for use in automobiles, home electric appliances, building materials, and the like, treatment with a chromate salt and treatment with zinc phosphate are generally conducted but toxicity of chromium has been regarded as a problem. The treatment with a chromium salt has problems that fumes of the chromate salt emit during the treating step, a large cost is required for waste water-treating facility, and chromic acid is eluted out of chemical conversion films. Further, hexavalent chromium compounds are assigned as carcinogenic substances for human by many public i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D3/56C25D5/26C25D15/02
CPCC25D3/565C25D3/56
Inventor KUBOTA, KENTAROHARUTA, YASUHIKOHIRAKI, TAKAYOSHI
Owner KANSAI PAINT CO LTD
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