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Development of Hexavalent Chromium-free Surface Treatment

Article of Honda R&D Technical Review Vol.17 No.1

Summary

A hexavalent chromium-free surface treatment has been developed for automotive parts which provides a coating possessing equivalent anti-corrosion performance and friction characteristics to conventional chromate layers containing chromium(VI). The treatment forms a passivation layer of trivalent chromium and metallic chelates at the interface with the zinc, while uniformly covering the surface with a protective zinc layer. It is an unusual feature of this process that a single procedure is able to form a double layer. Optimization of the amount of silica added has enabled the achievement of friction characteristics equivalent to those of conventional chromium(VI) chromate layers. The new surface treatment has resulted in a reduction in the amount of hexavalent chromium used in the production process and present in finished parts.

Reference

(1) Community legislation in force: Directive 2000/53/EC of the European Parliament and of Council of 18 September 2000 on end-of-life vehicles, Official Journal of the European Communities, L269, p. 34 (21/10/2000)
(2) Commission decision of 27 June 2002, amending Annex II of Directive 2000/53/EC of the European Parliament and of the Council on end-of-life vehicles, Official Journal of the European Communities, L170, p. 81-84 (2002)
(3) Suzuki, M.: Bousei Kanri, 40, p. 1(1996) (in Japanese)
(4) Suda, S., Ogino, M., Tanaka, N.: Tetsu to Hagane, 77, p. 1042 (1991) (in Japanese)
(5) Suda, S., Asari, M.: Zairyo to Kankyo, 46, p. 95-102 (1997) (in Japanese)
(6) Aoe, T.: Hyomen Gijyutsu, 49, p. 211 (1998) (in Japanese)
(7) Yoshimoto, I.: Neji Teiketsu Sekkeitai no Pointo, Gijyutsu Saakuru, Japanese Standards Association, p. 167-178 (2002) (in Japanese)
(8) Nishida, Y.: Zairyo to Kagaku no Kougaku, 41, p. 9 (2004) (in Japanese)
(9) Koudo, M. et al.: Hyoumen Gijyutsu, 54, p. 806 (2003) (in Japanese)
(10) Ishikawa, Y.: Hyoumen Gijyutsu, 44, p. 660 (1993) (in Japanese)
(11) Karube, T., Sako, R.: Hyoumen Gijyutsu, 53, p. 66 (2002) (in Japanese)

Author (organization or company)

Kazunori TAKIKAWA(Tochigi R&D Center)、Tsutomu MIYADERA(Tochigi R&D Center)、Toshiaki OTSUKA(Tochigi R&D Center)、Atsushi SHIRAKAWA(Tochigi R&D Center)、Mitsuo TAKASHIMA(Tochigi R&D Center)、Youji MATSUOKA(Tochigi R&D Center)

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