摘要
采用TIG焊在不锈钢表面堆焊Inconel 690合金,并取部分试件在压强150 MPa,温度为1 120℃的条件下热等静压(HIP)处理2h。借助于金相显微镜(OM)、扫描电镜(SEM)观察了HIP处理前后Inconel 690合金堆焊层的组织以及浸泡腐蚀后的微观形貌;并通过浸泡腐蚀试验、极化曲线和电化学阻抗谱,研究了HIP对堆焊层在含Cl-溶液中腐蚀行为的影响。结果表明:HIP处理后堆焊层内部晶界处析出大量碳化物(Cr23C6),致使其在腐蚀液中由先前的点蚀转变为了晶间腐蚀;HIP处理后堆焊层的耐蚀性变差,其腐蚀速率约为HIP处理前的2.3倍。
Inconel 690 alloy was deposited on the surface of 347 stainless steel by TIG surfacing technology, and a part of specimen was taken to be treated by hot isostatic pressing （HIP） treatment under the pressure of150 MPa at 1 120 ℃ for 2 hours. The microstructure of Inconel 690 alloy surfacing cladding hefore and after HIP treating and its micro morphology after immersion corrosion was obeserved by optical microscope （OM） and scanning electron microscopy （SEM）. Besides, the effect of HIP on corrosion hehavior of Inconel 690 alloy surfacing cladding in Cl- solution was studied by immersion corrosion, polarization curve and electrochemical impendence spectroscopy （EIS）. The results showed that a large number of carbide （Cr23 C6） precipitated at the grain boundary of surfacing cladding, which caused surfacing cladding to convert pitting corrosion into intergranular corrosion in corrosive solution. The corrosion resistance of the surfacing cladding became worse by HIP treatment, and the corrosion rate of the surfacing cladding after HIP was 2. 3 times than that before HIP.
作者
车洪艳
陈峰
董浩
刘国辉
CHE Hong-yan CHEN Feng DONG Hao LIU Guo-hui(Advanced Technology ＆ Materials Co. , Ltd. , Beijing 100081, China Engineering and Technology Research Center of Hot Isostatic Pressing, Zhuozhou 072750, China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China)
出处
《腐蚀与防护》
CAS
北大核心
2016年第11期892-895,共4页
Corrosion & Protection
基金
基金项目:AP/CAP屏蔽电机主泵推力盘材料国产化及应用研究(2015zx06002002)
关键词
INCONEL
690合金
热等静压
堆焊层
腐蚀
Inconel 690 alloy
hot isostatic pressing （HIP）
surfacing cladding
corrosion
