摘要
用低碳不锈钢(ER308L)对304不锈钢进行手工钨极氩弧焊接(TIG),并将其分别置于硫酸、盐酸、6%FeCl3和混合酸溶液中进行电化学腐蚀试验,测试了焊接接头在不同介质中的电化学腐蚀行为、电化学特征值以及晶间腐蚀倾向。结果表明:随H2SO4浓度的升高,焊缝金属抗电化学腐蚀能力先减小后增大,在H2SO4浓度约60%时最差;随HCl浓度升高,焊缝金属抗电化学腐蚀能力逐渐下降,钝化区间短暂,活化区较长;在混合酸中焊缝金属钝化区间较宽,但没有明显的钝化平台;在6%FeCl3溶液中阳极极化曲线出现明显的点蚀特征;焊缝金属的抗电化学腐蚀性能好于母材,其在盐酸和硫酸中的电化学腐蚀性能与浸泡腐蚀结果一致;焊接接头没有产生晶间腐蚀。
Low carbon stainless steel ER308L was used for tungsten inert gas ( TIG) arc welding of 304 stainless steel ( SUS304).The electrochemical corrosion behavior and electrochemical eigen-values in different solutions of the welded metal of hot rolled SUS304 austenite stainless steel plates weretested, and the susceptibility of the welded joint to intergranul arattack was examined.Results show that the resistance of the welded metal to electrochemical corrosion initially decreased andthen increased with increasing concentration of H2SO4 concentration.The poorest corrosion resistance was recorded at a H2SO4 concentration of 60%.At the same time, the resistance of the welded metal to electrochemical corrosion was continuously decreased with increasing concentration of HCl, while a very shortpassivation zone and a long activation zone were separately observed.Besides, a very long passivation zone was recorded in mix-acid, but no remarkable passivation flatform was detected there in.Moreover, remarkable pitting corrosion was recorded on theanode polarization curve in 6% FeCl3.In general, the weld metal had better resistance to electrochemical corrosion than that of the base metal, and the electrochemical corrosion data of the welded metal in HC1 and H2SO4.solutions agreed well with that of immersion corrosion tests.And no intergranular attack was observed forthe welded joint.
出处
《材料保护》
CAS
CSCD
北大核心
2009年第10期26-28,32,共4页
Materials Protection
基金
甘肃省有色金属新材料重点实验室开放基金(SKL05011)
关键词
电化学腐蚀
晶间腐蚀
奥氏体不锈钢
低碳不锈钢
TIG
焊接接头
electrochemical corrosion behavior
intergranular attack
austerutic stainless steel
low carbon stainless steel
TIG
welded joint
