高能喷丸处理工业纯钛焊接接头在10%HCl溶液中的腐蚀行为

采用高能喷丸处理技术(HESP)提高了工业纯钛焊接接头在10%HCl溶液中的耐蚀性,利用极化曲线和交流阻抗测试方法对其电化学腐蚀行为进行研究,结合Mott-Schottky曲线研究了工业纯钛焊接接头的腐蚀机理。结果表明,HESP处理工业纯钛焊接接头表层晶粒尺寸细化,从表层到基体晶粒尺寸由小到大呈梯度分布。HESP处理提高了工业纯钛焊接接头在10%HCl溶液中的耐蚀性,0.2 MPa-60min处理工艺是其最优处理参数。HESP处理焊接接头母材区在10%HCl溶液中的钝化膜具有n型半导体特性,材料表面缺陷较少,钝化膜排列致密,且处理后金属表面的钝化膜厚度大于未处理试样的钝化膜厚度,材料的耐腐蚀性能提高。

An Analyses of High Energy Shot-peening (HESP)Industrial Pure Titanium Welded Joints'Corrosion Behavior in 1 0% HCl Solution

The decay resistance of industrial pure titanium welding joint in 10% HCl solution was improved by HESP,and electrochemical corrosion behavior and mechanism of it was investigated by using polarization curve and alternation current impedance tests coupled with Mott-Schottky curve.The results revealed that the surface grain size of industrial pure titanium welding joint with HESP treatment reached to refinement,from the surface to matrix the grain size was from small to big with a gradient distribution. HESP treatment improved the decay resistance of industrial pure titanium welding joint in 10% HCl solution,the most optimized treatment index was treatment technique of 0.2 Mpa-60 min.The passive films of base metal of welding joint with HESP treatment in 10% HCl solution exhibited characteristic of n-type semiconductivity,material surface had relatively less defects,passive films ranged close,which implyed it had a relatively good decay resistance.After HESP treatment,the thickness of passive films of metal surface was bigger than untreated sample so that HESP improved the material decay resistance function.