Electroplating process of amorphous Fe-Ni-Cr alloy

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ÂÛÎÄ×÷ÕߣººÎÏæÖù Ïij©±ó Íõºì¾ü ¹¨ÖñÇå ½¯ººå­

ÎÄÕÂÒ³Â룺956 - 959

Key words£ºamorphism; Fe-Ni-Cr alloy; electroplating; trivalent chromium; chloride

Abstract: A novel process of electroplating amorphous Fe-Cr-Ni alloy in chloride aqueous solution with Fe(¢ò), Ni(¢ò) and Cr(¢ó) was reported. Couple plasma atomic emission spectrometry (ICP-AES), X-ray diffractometry(XRD), scanning electronic microscopy(SEM), microhardness test and rapid heating-cooling method were adopted to detect the properties of the amorphous Fe-Ni-Cr deposit, such as composition, crystalline structure, micrograph, hardness, and adherence between deposit and substrate. The effects of the operating parameters on the electrodeposit of the amorphous Fe-Ni-Cr alloy were discussed in detail. The results show that a 8.7?¦Ìm thick mirrorª²like amorphous Fe-Ni-Cr alloy deposit, with Vicker's hardness of 530 and composition of 45%¡«55% Fe, 33%¡«37% Ni, 9%¡«23% Cr was obtained by electroplating for 20min at room temperature(10¡«30¡æ), cathode current 10¡«16A/dm², pH=1.0¡«3.0. The XRD patterns show that there only appears a broad hump around 2¦È of 41¡ã¡«47¡ã for the amorphous Fe-Ni-Cr alloy deposit, while the SEM micrographs show that the deposit contains only a few fine cracks but no pinholes.