Role of nickel undercoat and reduction-flame heating on the mechanical properties of Cr-C deposit electroplated from a trivalent chromium based bath

被引：33
作者：
Huang, Ching An [1 ]
Lieu, Ui Wei [1 ]
Chuang, Chin Huo [1 ]
机构：
[1] Chang Gung Univ, Dept Mech Engn, Tao Yuan 333, Taiwan
来源：
SURFACE & COATINGS TECHNOLOGY | 2009年 / 203卷 / 19期
关键词：
Cr-C deposit; Flame heating; Hardening mechanism; Wear resistance; WEAR BEHAVIOR; ELECTROCHEMICAL-BEHAVIOR; HARD CHROMIUM; PULSE-CURRENT; ELECTRODEPOSITION; COATINGS; RESISTANCE; CORROSION;
D O I：
10.1016/j.surfcoat.2009.03.010
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, a surface hardening method for Cr-C deposits using flame heating for a short period is proposed. The hardness and wear resistance behavior of as-plated and flame-heated Cr-C deposits were investigated. The Cr-C deposits were electroplated on high carbon tool steel in a bath with trivalent chromium ions. Experimental results show that Cr-C deposits with an extremely high hardness of ca. 1700 Hv can be achieved after reduction-flame heating for 1 s. Meanwhile, the wear resistance of Cr-C deposited steel was improved after flame heating. To increase the wear resistance and bonding strength of the Cr-C deposited specimen, pre-electrode position of a thin Ni deposit between the Cr-C deposit and the steel substrate is recommended. A Ni undercoat with a thickness of few micrometers could reduce the crack density in the Cr-C deposit and increase the bonding strength between the Cr-C deposit and the steel substrate. As determined by a microstructure study, the as-plated Cr-C deposit has an amorphous structure, but transforms to a crystalline structure after flame heating. The main hardening mechanism is a result of the precipitation of nanograined diamond membranes, which can be extracted by immersing the flame-hardened Cr-C deposit in an etching solution comprised of 33 vol.% HNO3 and 67 vol.% HCl. (c) 2009 Published by Elsevier B.V.
引用
收藏
页码：2921 / 2926
页数：6
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