目的 探索温度对纯Cr涂层的抗腐蚀性能和表面形貌的影响.方法 采用多弧离子镀技术在锆合金表面制备纯Cr涂层,利用扫描电子显微镜(SEM)与Image J图像处理软件综合分析了纯Cr涂层的表面形貌,并对表面大颗粒的数目及其尺寸大小进行了统计和分析.采用X射线衍射仪对涂层的相结构进行了分析.利用划痕仪和电化学工作站,分析了温度对纯Cr涂层的膜基结合力和抗腐蚀性能的影响.结果 380℃时,涂层表面大颗粒的数目及其平均尺寸最大,温度升高到420℃时,其数值最小;当温度进一步提升到450、500℃时,大颗粒的数目、平均尺寸逐渐增大.温度的升高,使纯Cr涂层由(110)晶面择优生长转为(200)晶面择优生长,晶粒尺寸随温度变化的规律为先减小后增大.涂层的结合力和抗腐蚀性能随温度的变化规律与大颗粒数目随温度的变化规律相反,呈先提高后降低的趋势.结论 420℃时,涂层表面大颗粒的数目及其平均尺寸最小,结合力和抗腐蚀性能较强,组织结构致密度高,晶粒细小,表面光滑平整.
The work aims to explore the effect of temperature on corrosion resistance and surface morphology of pure Cr coat-ing. The Cr coating was prepared on the surface of zirconium alloy by means of arc current plating process. Scanning electron mi-croscopy (SEM) and Image J image processing software were used to analyze surface morphology of pure Cr coating, count and analyze size and number of large particles on the surface. X-ray diffractometer (XRD) was applied to analyze phase structure of the coating. The effect of temperature on film adhesion and corrosion resistance of the Cr coating was analyzed using scratch tester and CS electrochemical workstation. The number and average size of large particles on the coating surface were the maximum at 380℃, and the minimum at 420℃; the both increased gradually as the temperature rose to 450℃, 500℃. With the rise of temper- ature, growth mode of the Cr coating changed from preferred growth on (110) crystal plane to that on (200) crystal plane. The aver-age crystal size firstly decreased and then increased as the temperature varied. Varying pattern of coating adhesion and corrosion re-sistance with increasing temperature was contrary to that of the large particles, which firstly increased and then decreased. The number and average size of large particles on the surface of the coating are the maximum at 420℃, the adhesion and corrosion re-sistance are high, the organizational structure is dense, grains are fine and surface is smooth.
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