摘要
研究了退火态 1Cr18Ni9Ti不锈钢在 78± 5℃的纯NaCl和NH4Cl溶液、NH4Cl +NaCl混合溶液中的应力腐蚀性能。结果表明 ,在 2 2 %NaCl溶液中试样经 10 0 0h试验不发生应力腐蚀开裂 ,而浸在 3%NH4Cl+17%NaCl、5 %NH4Cl+10 %NaCl、5 %NH4Cl+17%NaCl、5 %NH4Cl+2 5 %NaCl 4种混合溶液的试样 ,经过小于 10 0 0h的试验就产生应力腐蚀裂纹或断裂 ,即NH+ 4 促进了 1Cr18Ni9Ti钢在NaCl溶液中的应力腐蚀开裂。根据扫描断口形貌和裂纹扩展途径的金相观察 ,还探讨了在混合溶液中的应力腐蚀机制。
The stress corrosion property of 1Cr18Ni9Ti stainless steel in annealed condition in pure NaCl at 78±5℃, NH4Cl, NH 4 Cl+NaCl solutions was studied. The result shows that SCC did not occur when the sample was in 22%NaCl solution for less than 1 000h, and stress corrosion or cracking occurred when the samples in 3%NH 4C+17%NaCl, 5%NH 4Cl+10%NaCl, 5%NH 4Cl+17%NaCl, 5%NH 4Cl+25%NaCl solutions for less 1 000h, so it was considered that NH+ 4 ion accelerated SCC of 1Cr18Ni9Ti in NaCl solution. The stress corrosion mechanism in mixed solutions was studied based on the metallographic observations of scanning fracture shapes and crack extension direction.
出处
《化工机械》
CAS
2004年第6期340-343,383,共5页
Chemical Engineering & Machinery
