Characteristics of the interface of a laser-quenched steel substrate and chromium electroplate

SURFACE & COATINGS TECHNOLOGY

卷:201

Article

Li, Huaixue ; Chen, Guangnan ; Zhang, Guoxiang ; Zhang, Kun ; Luo, Gengxing

关键词: interfaces;    electroplating;    chromium;    laser quenching;   

DOI  :  10.1016/j.surfcoat.2006.01.011

来源: Elsevier

【 摘 要 】

The interface of a laser-discrete-quenched steel substrate and as-deposited chromium electroplate was investigated by ion beam etching, dissolving-substrate-away and using a Vickers microhardness tester, in an attempt to reveal the mechanism that the service life of the chromium-coated parts is increased by the duplex technique of laser pre-quenching plus chromium post-depositing. The laser quenching of the steel substrate can reduce the steep hardness gradient at the substrate/chromium interface and improve the load-bearing capacity of chromium electroplate. Moreover, the laser quenching prior to plating has an extremely great effect on the morphologies and microstructure of the substrate/chromium interface: there is a transient interlayer at the original substrate/chromium interface while there is not at the laser-quenchedzone/chromium interface; the near-substrate surface microstructure and morphologies of the free-standing chromium electrodeposits, whose substrate was dissolved away with nital 30% in volume, inherit the periodically gradient characteristics of the laser-discrete-quenched substrate surface. (c) 2006 Elsevier B.V. All rights reserved.

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