X80管线钢在连木沁土壤模拟溶液中的腐蚀行为与机理研究

发布时间：2019-01-03 11:04

【摘要】：采用失重法、电化学测试、表面分析方法,研究了X80母材和焊接热影响区(HAZ)在连木沁土壤模拟溶液中的腐蚀行为。结果表明:X80母材和HAZ在上述溶液中浸泡7 d后,腐蚀程度均为中度腐蚀,X80母材的腐蚀速率以及在3、7 d的自腐蚀电流密度都小于HAZ的。与母材相比,HAZ的腐蚀产物表面裂纹更多,外层空隙更大,腐蚀性离子更易到达管材表面,加速腐蚀。在连木沁土壤模拟溶液中,X80母材和HAZ腐蚀产物为Fe_2O_3、Fe S、Fe_(1-x)S、Fe_2O_3·H_2O。另外,土壤中的O_2、SO_4~(2-)和Cl~-对管材的腐蚀起主导作用。X80母材的耐蚀性优于HAZ的。X80钢的腐蚀机制符合阳极溶解。
[Abstract]:The corrosion behavior of X80 base metal and welding heat affected zone (HAZ) in Lianmuqin soil simulated solution was studied by means of weightlessness electrochemical measurement and surface analysis. The results showed that the corrosion degree of X80 base metal and HAZ were moderate after being immersed in the solution for 7 days. The corrosion rate of X80 base metal and the corrosion current density of X80 base metal at 3 ~ 7 days were lower than those of HAZ. Compared with the base metal, the corrosion products of HAZ have more surface cracks and larger outer voids, and the corrosive ions can reach the pipe surface more easily and accelerate the corrosion. In Lianmuqin soil simulated solution, X80 base material and HAZ corrosion products are Fe_2O_3,Fe SznFe1-x SfFe2OS _ 2s _ 3H _ 2O. In addition, O2SO4- and Cl~- in soil play a leading role in corrosion of pipes. The corrosion resistance of X80 base metal is better than that of HAZ steel. The corrosion mechanism of X80 steel accords with anodic dissolution.
【作者单位】：西安石油大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51271146) 陕西省自然科学基金资助项目(2016JQ5068) 陕西省重点学科专项资金资助项目(YS37020203) 陕西省能源化工过程强化重点实验室资助项目(SXECPI201503)
【分类号】：TG172.4

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