镍基高温合金M17和M38G的电化学腐蚀行为研究

表面技术 , 2006, 35(4): 15-33. doi: 10.3969/j.issn.1001-3660.2006.04.005

镍基高温合金M17和M38G的电化学腐蚀行为研究

马敬翙 ^1, , 刘光明 ^2, , 曾潮流 ^3, , 杜楠 ^4, , 赵晴 ^5,

1.南昌航空工业学院,无损检测技术教育部重点实验室,江西,南昌,330034

2.南昌航空工业学院,无损检测技术教育部重点实验室,江西,南昌,330034

3.中国科学院金属研究所腐蚀与防护国家重点试验室,辽宁,沈阳,110015

4.南昌航空工业学院,无损检测技术教育部重点实验室,江西,南昌,330034

5.南昌航空工业学院,无损检测技术教育部重点实验室,江西,南昌,330034

基金项目: 江西省材料科学与工程研究中心资助项目(ZX200301022;ZX200401009)

关键词：镍基 , 高温合金 , 点蚀 , 电化学方法 , 腐蚀行为

Electrochemical Behavior of Two Ni-based Superalloys M17 and M38G in Aqueous Solution

采用电化学方法、扫描电镜、能谱分析等技术,研究了常温下镍基高温合金M17和M38G在NaCl溶液和含S2O2-3的NaCl溶液中的腐蚀行为.结果表明,在含质量分数为3.5% NaCl的溶液中,M17和M38G均会遭受严重的点腐蚀;向NaCl溶液(NaCl质量分数为3.5%)添加Na2S2O3(Na2S2O3质量分数为1.5%)后,由于溶液中的S2O2-3在试样表面活性点与Cl-竞争吸附并与H+结合,使两种合金的点蚀均受到抑制;M38G中存在微量的Nb、Ta、Mo等元素使得M38G合金在NaCl溶液中的耐腐蚀性能明显优于M17合金.

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