多弧离子镀(Ti,Cr)N镀层耐蚀性研究-《电镀与精饰》

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Title:: Research of Corrosion Resistance of (Ti, Cr) N Coatings Deposited by Multi-arc Ion Plating

摘要:: 采用多弧离子镀技术在高速钢表面制备了(Ti,Cr)N镀层,通过电化学工作站对镀层的塔菲尔曲线进行测试,分析镀层的耐腐蚀性,并采用质量变化法对电化学测试结果进行了验证。利用扫描电子显微镜观察了(Ti,Cr)N镀层腐蚀前后的微观形貌。结果表明,随电流比例ICr/ITi的增大,(Ti,Cr)N镀层表面晶粒尺寸逐渐减小。当ICr/ITi为90 A/60 A时,基体的自腐蚀电位由-0.750 V正移至-0.534 V,基体的腐蚀速率降低85.67%,耐蚀性提高。基体的腐蚀主要为点蚀和均匀腐蚀,(Ti,Cr)N镀层主要为小孔腐蚀。

Abstract:: (Ti,Cr) N coatings were prepared on the surface of high speed steel by multi-arc ion plating technology. The Tafel polarization curve of coating was tested by electrochemical workstation to analyze its corrosion resistance. The method of mass-changing was utilized to verify the electrochemical measurement results. The microstructure of(Ti,Cr) N coating before and after corrosion was observed by SEM. The results showed that the grain size of the coating surface gradually decreased with the increasing of I_(Cr)/I_(Ti).When I_(Cr)/I_(Ti) was 90 A/60 A,the self-corrosion potential positively shifted from -0. 705 V to -0. 534 V,the corrosion rate of the substrate decreased by 85. 67% and the corrosion resistance was improved. The corrosion mechanism of matrix was mainly pitting and uniform corrosion,while(Ti,Cr) N coatings was mainly pitting corrosion.