Chen Qiang, Xie Zhiwen, Chen Tian, Gong Feng
Southwest Technology and Engineering Research Institute, Chongqing 400039, China.
School of Mechanical Engineering and Automation, University of Science and Technology Liaoning, Anshan 114051, China.
Materials (Basel). 2016 Nov 26;9(12):963. doi: 10.3390/ma9120963.
TiN/SiO duplex coatings were synthesized on AISI304 stainless steel by plasma immersion ion implantation and deposition (PIIID) followed by radio frequency magnetron sputtering (RFMS). The microstructure and tribocorrosion failure behaviors of the duplex coatings were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy, reciprocating-sliding tribometer, and electrochemical tests. The as-deposited duplex coating had a two-layered columnar growth structure consisting of face-centered cubic TiN and amorphous SiO. Sliding tests showed that the TiN interlayer had good adhesion with the substrate, but the SiO layer suffered from severe delamination failure. Friction force induced a number of micro-cracks in the coating, which provided channels for the diffusion of NaCl solution. The tribocorrosion test showed that the duplex coating exhibited a lower wear-performance in NaCl solution than in ambient atmosphere. Multi-scale chloride ion corrosion occurred simultaneously and substantially degraded the bonding strength of the columnar crystals or neighboring layers. Force-corrosion synergy damage eventually led to multi-degradation failure of the duplex coating. The presented results provide a comprehensive understanding of the tribocorrosion failure mechanism in coatings with duplex architecture.
采用等离子体浸没离子注入与沉积（PIIID）随后进行射频磁控溅射（RFMS）的方法，在AISI304不锈钢上合成了TiN/SiO双层涂层。通过X射线衍射、X射线光电子能谱、扫描电子显微镜、原子力显微镜、往复滑动摩擦磨损试验机以及电化学测试等手段，研究了双层涂层的微观结构和摩擦腐蚀失效行为。沉积态的双层涂层具有由面心立方TiN和非晶SiO组成的双层柱状生长结构。滑动试验表明，TiN中间层与基体具有良好的附着力，但SiO层出现了严重的分层失效。摩擦力在涂层中产生了许多微裂纹，为NaCl溶液的扩散提供了通道。摩擦腐蚀试验表明，双层涂层在NaCl溶液中的耐磨性能低于在大气环境中的耐磨性能。多尺度氯离子腐蚀同时发生，显著降低了柱状晶体或相邻层之间的结合强度。力腐蚀协同损伤最终导致双层涂层的多重退化失效。所呈现的结果为理解具有双层结构涂层的摩擦腐蚀失效机理提供了全面的认识。
