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采用多弧离子镀技术,利用Cr靶和TiAl靶,在活塞环材料65 Mn钢基体上制备了CrTiAlN复合涂层,并对电镀Cr、CrN和CrTiAlN复合涂层在800℃下的抗高温腐蚀性能进行了比较分析,用扫描电镜、能谱仪和X射线衍射仪观察分析了样品表面高温腐蚀氧化膜。结果表明:CrTiAlN复合涂层具有优异的抗高温腐蚀性能,在800℃时仍具有良好的抗高温腐蚀性能,其氧化机理是O向涂层内部扩散氧化,在高温腐蚀过程中,CrTiAlN涂层中的Cr发生了选择性氧化,优先形成了Cr2O3,CrTiAlN涂层氧化层区域的结构由外至里组成顺序为Cr2O3、Al2O3+TiO2、(Cr,Ti,Al)N。涂层外层的Cr2O3氧化物有利于阻碍氧元素向涂层内部扩散,能够降低涂层的高温腐蚀速度。
CrTiAlN composite coating was prepared on 65 Mn steel with piston ring by using multi-arc ion plating technology and Cr target and TiAl target. The corrosion resistance of Cr, CrN and CrTiAlN composite coatings at 800 ℃ The comparative analysis was carried out. The high temperature corrosion oxide film on the sample surface was observed and analyzed by SEM, EDS and XRD. The results show that the CrTiAlN composite coating has excellent high temperature corrosion resistance and good anti-high temperature corrosion resistance at 800 ℃. The oxidation mechanism of the coating is diffusion-O oxidation into the coating. During high temperature corrosion, CrTiAlN coating Of Cr selectively oxidized and preferentially formed Cr2O3. The structure of oxide layer in CrTiAlN coating is Cr2O3, Al2O3 + TiO2, (Cr, Ti, Al) N from outside to inside. The Cr2O3 oxide in the outer layer of the coating helps prevent oxygen from diffusing into the interior of the coating and can reduce the corrosion rate of the coating at high temperature.