通过模拟普光气田元素硫沉积环境,调节腐蚀体系的温度,研究了固溶强化镍基合金825的腐蚀特征,并利用扫描电子显微镜(SEM)、能谱仪(EDS)等技术手段研究了镍基合金825发生点蚀后腐蚀产物的形貌和成分.结果表明,一定温度下元素硫(S_8)与酸性NaCl溶液共同作用使镍基合金825产生明显的以点蚀为主的局部腐蚀.腐蚀产物层存在开裂现象,其腐蚀产物主要由Cr、Ni、S、O等元素组成.镍基合金825在高于元素硫熔点的温度及Cl~-存在条件下易发生局部腐蚀.
By simulating the environment of PUGUANG gas and adjusting the temperature of the system, corrosion characteristics of solid-solution strengthened nickel-base alloy 825 were investigated. Scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS) were applied to characterize the microstruetures and compositions of the corrosion products. Results show that pitting is mainly induced on the alloy surface due to the effect of sulfur,chlorine and acid. Cracking is found in the corrosion products which are composed of Cr,Ni,S,O. Nickel base alloy 825 is very susceptible to localized corrosion by the synergetic effect of sulfur,chlorine and acid.
参考文献
| [1] | 李瑛.元素硫对特高含H2S气井用油管钢的腐蚀[J].腐蚀科学与防护技术,1996(03):252. |
| [2] | Y.M.Pan;D.S.Dunn .Grain-Boundary Chemistry and Intergranular Corrosion in Alloy 825[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2000(4):1163-1173. |
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