高压H2S环境腐蚀产物的晶型结构演化及其对低合金钢耐蚀性能的影响

项目名称： 高压H2S环境腐蚀产物的晶型结构演化及其对低合金钢耐蚀性能的影响

项目编号： No.51271201

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 郑树启

作者单位： 中国石油大学（北京）

项目金额： 80万元

中文摘要： 高含硫油气开发用低合金钢的腐蚀及环境开裂是目前石油天然气工业界亟待解决的重大工程问题，前期研究发现，高压H2S环境中，随H2S压力和温度变化低合金钢的腐蚀产物晶体结构类型发生改变，并且低合金钢抗硫化物应力腐蚀开裂性能随之发生变化，这表明腐蚀产物的晶型演化与低合金钢的耐蚀性能有依存关系，这对揭示低合金钢在高含硫环境中的适用性具有重要意义。为此，本项目首先开展高压H2S条件下，低合金钢腐蚀产物晶体结构类型演化规律的研究，揭示H2S分压、温度等环境因素与FeS晶型结构转变的对应关系；其次，利用高压氢渗透试验和抗硫化物应力腐蚀开裂试验，研究不同晶体结构的腐蚀产物对低合金钢耐蚀性能的影响规律；然后，利用材料热力学、晶体学原理研究不同晶型转变的热力学和动力学条件，结合溶液中阳离子和阴离子在不同晶型腐蚀产物中的行为特点，最终揭示高含H2S环境腐蚀产物晶型演化规律及其对低合金钢耐蚀性能的影响。

中文关键词： 硫化氢；低合金钢；腐蚀产物；晶体结构；耐蚀性能

英文摘要： It is known that the structures of passive films covered on the surface of corrosion resistance alloy determine the corrosion resistance of alloy. In comparison, for low alloy steel, it can be used in the highly acidic environment by controlling its microstructure, chemical compositions and mechanical properties to meet the requirements of usage. It is found that the crystal structure type of corrosion product films formed on the surface of low alloy steel is expected to transform with the change of H2S partial pressure, as well the low alloy steel resistance to sulfide stress corrosion cracking and hydrogen permeation current in high H2S partial pressure environment, indicating that the crystal structure type of corrosion product films is related to the corrosion resistance of low alloy steel. Therefore, the studies on the evolution mechanism of the crystal structures of the corrosion product films of the low alloy steel in high H2S partial pressure conditions are carried out firstly to show the corresponding relationship between the FeS crystal structure transformation and the environmental factors, such as temperature and H2S partial pressure. Then, the influences of different crystal structures of corrosion product films on hydrogen permeation and corrosion resistance performances are investigated by high pr

英文关键词： hydrogen sulfide；low alloy steel；corrosion products；crystal structure；corrosion resistance