高碳铬不锈钢泵阀材料的研究 Ⅱ.泵阀材料的腐蚀、磨蚀和腐蚀疲劳行为

An Investigation of High Carbon chromium Stainless Steel Pump Valve Materials——The Behaviour of Corrosion and Fretting Corrosion and Corrosion Fatigue for Pump Value Materials

对９Ｃｒ１８Ｍｏ和ＧＣｒ１５两种钢的腐蚀、磨蚀和腐蚀疲劳行为进行了实验研究．结果表明，在质量分数为２％～５％硫酸，１％盐酸，４０％硝酸，３．５％ＮａＣｌ水溶液和蒸馏水中，９Ｃｒ１８Ｍｏ的抗腐蚀性能优于ＧＣｒ１５；在含０．０２％与５％沙量的沙浆中，９Ｃｒ１８Ｍｏ的年磨蚀率低于ＧＣｒ１５的数值；在空气、蒸馏水和３．５％ＮａＣｌ水溶液中，９Ｃｒ１８Ｍｏ的疲劳裂纹扩展速率也低于ＧＣｒ１５．９Ｃｒ１８Ｍｏ和ＧＣｒ１５在中性水溶液中疲劳裂纹扩展均表现为氢脆机制．

The behaviour of corrosion and fretting corrosion and corrosion fatigue for 9Cr18Mo and GCr15 steels were experimental researched in this paper. The results indicated that the resistant corrosion property of 9Cr18Mo was better than that of GCr15 in 2%～5% sulphuric acid, 1% hydrochloric acid, 40% nitric acid, 3.5% sodium chloride aqueous solution and distilled water at different temperatures, and the rate of fretting corrosion for 9Cr18Mo was lower than that of GCr15 in 0.02% and 5% sand liquid, and the fatigue crack growth rate for 9Cr18Mo was also lower than that of GCr15 in air, distilled water and 3.5% NaCl solution. The fatigue growth mechanism for both 9Cr18Mo and GCr15 is hydrogen embrittlement in neutral aqueous solution.