Title: Properties of new organic-silicate composite coated steel sheet (EZN-UCII) for automotive body panels

Authors: M. Yamashita, T. Kubota, N. Yoshimi, T. Watanabe, Y. Matsuda

Addresses: Steel Research Centre, NKK Corporation, Fukuyama, Japan. ' Steel Research Centre, NKK Corporation, Fukuyama, Japan. ' Steel Research Centre, NKK Corporation, Fukuyama, Japan. ' Steel Research Centre, NKK Corporation, Fukuyama, Japan. ' Steel Research Centre, NKK Corporation, Fukuyama, Japan

Abstract: To improve the performance of zinc-rich painted steel sheets, such as Zincrometal, NKK first developed Zn-Ni alloy plated steel sheet with a thin (about 1 pm) organic-silicate composite film entirely different from a zinc-rich paint film. This product (EZN-UC) is superior to zinc-rich painted steel sheet in corrosion resistance, anti-powdering property and weldability. EZN-UC, however, is not able to provide bake hardenability due to the high curing temperature of the film. NKK has developed new organic-silicate composite coated steel sheet (EZN-UCII), which allows the coating to be cured in the temperature range where bake hardenability can be maintained. Newly developed EZN-UCII has excellent properties, such as corrosion resistant precoated steel sheet for motor car bodies. EZN-UCII attained higher corrosion resistance than EZN-UC and also provides excellent weldability and anti-powdering property equivalent to EZN-UC. NKK has been producing EZN-UCII for motor manufacturers since November 1987.

Keywords: anti-powdering properties; corrosion resistance; painted steel sheets; thin film coatings; weldability; zinc nickel alloys; alloy plated steel sheet; composites; automotive body panels; car body panels; vehicle design; automobile industry; bake hardening; precoated steel sheet.

DOI: 10.1504/IJMPT.1991.036634

International Journal of Materials and Product Technology, 1991 Vol.6 No.2, pp.160 - 172

Published online: 05 Nov 2010 *

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