摘要
为提高特种机械零件的耐磨性和耐腐蚀性,采用过滤阴极真空电弧技术在其表面沉积了一层厚度约为2μm的类金刚石碳(DLC)膜。利用扫描电子显微镜(SEM)、纳米压痕仪、摩擦磨损试验机和电化学工作站分别测试了CrNi3MoVA钢与施加DLC膜的CrNi3MoVA钢(以下简称DLC膜)的微观结构、纳米力学性能、摩擦磨损性能及耐腐蚀性。结果表明DLC膜的硬度较裸钢提高了65%,弹性模量降低了约32%;裸钢稳定的摩擦系数为0.65~0.75,而DLC膜稳定的摩擦系数仅为0.10~0.11;裸钢的磨损机制主要为磨粒磨损和塑性流动,而DLC膜的磨损机制主要为剥层磨损;DLC膜的腐蚀电流密度较裸钢的腐蚀电流密度低了两个数量级,自腐蚀电位正移了逾0.3V,电化学反应阻抗高了3个数量级。DLC膜能够极大地提高裸钢的耐磨性和耐腐蚀性。
A layer of diamond-like carbon(DLC)film with a thickness of about 2μm was deposited on special machine parts surface by means of filtering cathodic vacuum arc technology to improve its wear resistance and corrosion resistance.The microstructure,nano-mechanical properties,friction and wear performance and corrosion resistance of CrNi3 MoVA and CrNi3 MoVA coated with DLC film(hereinafter referred to as DLC film)were tested by employing scanning electron microscope(SEM),nanoindenter,friction and wear tester and electrchemical workstation.The results showed that the hardness of the DLC film increase about 65%than that of the bare steel and the elasticity modulus reduced about 32%;the steady friction of the bare steel was 0.65-0.75 whilst that of the DLC film only 0.10-0.11;the wear mechanism of the bare steel was mainly abrasion wear and plastic flowing while that of the DLC film delamination wear;in contrast to bare steel,the corrosion current density of the DLC film reduced by two orders of magnitude,the corrosion potential shifted more than 0.3 Vto the positive direction and the electrochemical impedance increased by three orders of magnitude.The DLC film can greatly improve wear resistance and corrosion resistance of the bare steel.
引文
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