ELECTROPLATED Zn-Ni-SiO2 COMPOSITE COATINGS TREATED WITH A SILANE COUPLING AGENT TO REPLACE CHROMATING
来源期刊：Acta Metallurgica Sinica2005年第3期
论文作者：K. Murakami M. Hino T. Kanadani A. Saijo M. Hiramatsu
Key words：electrodeposition; Zn-Ni-SiO2 composite coating; silane coupling treatment; chrome-free; environmental friendliness;
Abstract: The fixing of a silane coupling agent to Zn-Ni-silica (SiO2) composite coatings was studied for the purpose of developing a coating process as an alternative to chromating. The corrosion resistance of Zn-Ni-silica composite coatings was remarkably improved by the silica nanoparticles in the composite, which were dispersed in the surface of this film. The silane coupling agent formed chemical bonds with the inorganic silica particles during the silane coupling treatment on these composite coatings. The treatment suppressed the formation of white corrosion products to the same extent as chromating, as measured in salt spray tests. It is concluded that treating Zn-Ni-silica composite coatings with silane coupling agents is a viable alternative technique to chromating.
K. Murakami1，M. Hino1，T. Kanadani2，A. Saijo3，M. Hiramatsu1
(1.Industrial Technology Research Institute of Okayama Prefecture, Haga, Okayama-shi,Okayama 701-1296, Japan;
2.Graduate School of Okayama University of Science, Ridai-cho, Okayama-shi, Okayama 700-0005, Japan;
3.Hori Metal Finishing Industry Co.,Ltd., Abe, Ochiai-cho, Takahashi-shi, Okayama 716-0061, Japan)
Abstract:The fixing of a silane coupling agent to Zn-Ni-silica (SiO2) composite coatings was studied for the purpose of developing a coating process as an alternative to chromating. The corrosion resistance of Zn-Ni-silica composite coatings was remarkably improved by the silica nanoparticles in the composite, which were dispersed in the surface of this film. The silane coupling agent formed chemical bonds with the inorganic silica particles during the silane coupling treatment on these composite coatings. The treatment suppressed the formation of white corrosion products to the same extent as chromating, as measured in salt spray tests. It is concluded that treating Zn-Ni-silica composite coatings with silane coupling agents is a viable alternative technique to chromating.
Key words:electrodeposition; Zn-Ni-SiO2 composite coating; silane coupling treatment; chrome-free; environmental friendliness;
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