摘要
用焊接热模拟及电化学测试技术研究了内壁经镍基粉喷焊后再用不锈钢焊条进行打底焊的低碳钢钢管焊接接头热影响区喷焊层的耐蚀性能。结果表明 ,热影响区各微区喷焊层的热力学腐蚀倾向与均匀腐蚀、点蚀性能有很好的一致性 ,由好到差依次为 12 0 0℃区→ 95 0℃区→原始试块→ 10 5 0℃区→ 13 5 0℃区。金相及SEM分析表明 ,喷焊层的组织状态对自身的耐蚀性有很大影响。等轴晶的耐腐蚀性优于柱状晶 ,且在晶粒形态相同的情况下 ,喷焊层晶界净化程度越高、组织越致密其耐腐蚀性越好。
Electrochemical techniques and heat affected zone (HAZ) simulation testing are applied to evaluate the corrosion resistance of nickel\|base alloy in the HAZ at steel pipe joints. The joints are formed by spraying nickel base powder on the ends of lower carbon steel pipes and then welding the claded pipe ends by the use of high alloy electrodes. The highest resistance to corrosion is at the 1200 ℃ area, the second is at the 950 ℃ area, next in the as sprayed area and the 1050 ℃ area, and the weakest is at the 1350 ℃ area . It is found that the grain shape and the purity of spray welding layer have a great effect on the corrosion resistance. The property of columnar structure is worse than that of equiax crystal. The purer the spray welding layer is, the better the corrosion resistance will be. Rare earth can be added to the spraying powders in order to improve the corrosion resistance of the spray welding layers near the weld.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2001年第6期71-73,共3页
Journal of the University of Petroleum,China(Edition of Natural Science)
关键词
钢管
喷焊层
焊接接头
耐蚀性
电化学
模拟试验
steel pipe
spray coating
welded joint
corrosion resistance
electrochemistry
simulation testing
