Characteristics of electrodeposited chromium

IF 1.5 4区材料科学 Q4 ELECTROCHEMISTRY

Transactions of The Institute of Metal Finishing Pub Date : 1997-01-01 DOI:10.1080/00202967.1997.11871175

M. El-Sharif, C. Chisholm

引用次数: 16

Abstract

Organic complexants are essential components for the electrodeposition of chromium from chromium (III) based electrolytes. However, during electrolysis these complexants suffer decomposition and their compounds become incorporated in the deposit. The properties are considerably altered by the presence of these inclusions. In this paper the effect of addition of glycine to a high speed and still chromium (III) electrolyte was studied. Component analysis of the deposits indicated the presence of carbon, nitrogen and hydrogen. The effects of current density, concentration of complexant, bath temperature and electrolyte velocity on the concentration of the above elements are presented. The hardness of the deposits was greatly increased after heat treatment at 400 to 800°C. X-ray diffraction show the as-deposited chromium to be amorphous and the formation of carbide compounds after heat treatment. The corrosion behaviour of chromium deposits was investigated by using salt spray test and electrochemical techniques.

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电沉积铬的特性

有机络合剂是铬(III)基电解质电沉积铬的必要成分。然而，在电解过程中，这些络合剂受到分解，它们的化合物被纳入沉积物中。这些夹杂物的存在大大改变了材料的性质。本文研究了甘氨酸在高速静止铬(III)电解液中加入的效果。沉积物成分分析表明，沉积物中存在碳、氮和氢。研究了电流密度、络合剂浓度、镀液温度和电解液流速对上述元素浓度的影响。在400 ~ 800℃热处理后，镀层的硬度大大提高。x射线衍射结果表明，经热处理后沉积的铬呈无定形，并形成碳化物。采用盐雾试验和电化学技术研究了铬镀层的腐蚀行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transactions of The Institute of Metal Finishing 工程技术-材料科学：膜

CiteScore

3.40

自引率

10.50%

发文量

审稿时长

3 months

期刊介绍： Transactions of the Institute of Metal Finishing provides international peer-reviewed coverage of all aspects of surface finishing and surface engineering, from fundamental research to in-service applications. The coverage is principally concerned with the application of surface engineering and coating technologies to enhance the properties of engineering components and assemblies. These techniques include electroplating and electroless plating and their pre- and post-treatments, thus embracing all cleaning pickling and chemical conversion processes, and also complementary processes such as anodising. Increasingly, other processes are becoming important particularly regarding surface profile, texture, opacity, contact integrity, etc.