材料工程Issue(8)：24-29,6.
工艺参数对不锈钢表面激光熔覆Ni基涂层组织及耐腐蚀性能的影响
Effects of Technological Parameters on Microstructure and Corrosion Resistance of Laser Cladding Ni-based Coating on Stainless Steel Surface
摘要
Abstract
A 6kW CO2 laser apparatus was used for cladding Ni25WC35 alloy powder on lCrl8Ni9Ti stainless steel surface by different technological parameters to obtain single-pass cladding coating. The phase composition of cladding layer and effects of technological parameters on corrosion resistance of coating were studied. The results show that the coating mainly consists of(Fe,Ni)solid solution, W2C by WC irrsitu reaction, and contains CrNiFeC, Cu3.8 Ni compounds and some hard-phase such as FeW3C,Ni2Si,Fe3Ni3B. Optical microscope analysis results indicated that microstructure of cladding coating was homogeneous, dense, forming a good metallurgical bonding layer. Electrochemical corrosion measurements in 5. 0%NaCl saturated solution results show that, with increasing laser power, the corrosion resistance presents a trend of decrease; with increasing scanning speed, the corrosion resistance presents firstly increasing, and then a trend of decrease. The maximum self-corrosion potential of cladding coating was -554. 70mV, the lower corrosion current density was 0. 55jnA · cm~2. As a result, the process parameter of the best corrosion resistance was P=3. OkW and v=500mm · min"1.关键词
激光熔覆/镍基涂层/不锈钢/显微组织/耐腐蚀性能Key words
laser cladding/Ni-based layer/stainless steel/microstructure/corrosion resistance分类
矿业与冶金引用本文复制引用
曾维华,刘洪喜,王传琦,张晓伟,蒋业华..工艺参数对不锈钢表面激光熔覆Ni基涂层组织及耐腐蚀性能的影响[J].材料工程,2012,(8):24-29,6.基金项目
国家自然科学基金资助项目(51165015) （51165015）
云南省自然科学基金资助项目(2008ZC021M) （2008ZC021M）
昆明理工大学分析测试基金资助项目(2009-022) （2009-022）
