“高温-结盐-CO_(2)/O_(2)”多因素耦合环境下热浸铝镀层腐蚀行为研究  

Corrosion Behavior of Hot-dip Aluminum Coating in“High Temperature-salt Deposited-CO_(2)/O_(2)”Multi-degree Coupling Environment

作　　者：陈庆国 唐全宏 秦振杰[1] 李一凡 李磊 李轩鹏 袁军涛 苏航 付安庆 CHEN Qingguo;TANG Quanhong;QIN Zhenjie;LI Yifan;LI Lei;LI Xuanpeng;YUAN Juntao;SU Hang;FU Anqing(PetroChina Tarim Oilfield Company,Korla 841000,China;The 12th Oil Production Plant of China National Petroleum Corporation Changqing Oilfield Company,Xi'an 710014,China;State Key Laboratory for Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an 710077,China)

机构地区：[1]中国石油塔里木油田公司,库尔勒841000 [2]中国石油天然气集团长庆油田公司第十二采油厂,西安710014 [3]中国石油集团工程材料研究院有限公司石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077

出　　处：《中国腐蚀与防护学报》2023年第3期569-577,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(21908250);宁波市科技创新2025重大专项(2020Z108)。

摘　　要：通过微观形貌观察、极化曲线测试、240℃-结盐-CO_(2)/O_(2)多因素耦合环境下的模拟实验,明确了热浸铝镀层在油田重沸器管束中的适用性。热浸铝试样主要由纯Al层和舌状Fe_(2)Al_(5)合金层组成,厚度在150~200μm。模拟油田水中的极化曲线对比结果表明,在30℃时,热浸铝试样相比20#钢腐蚀电流密度降低约300倍,具有很好的耐蚀性能。采用高温高压反应釜模拟现场管束服役工况,高温高压模拟工况结果表明,240℃-结盐-CO_(2)/O_(2)多因素耦合环境下,20#钢的均匀腐蚀速率为0.68±0.04 mm/a,点蚀深度达到70.5μm,表面的腐蚀产物主要为Fe_(3)O_(4)和Fe_(2)O_(3),产物膜内存在大量裂纹等缺陷;而热浸铝镀层腐蚀速率为0.08±0.02 mm/a,腐蚀主要出现在纯Al层,对应的腐蚀产物为Al(OH)_(3)。综合结果表明,热浸铝镀层在240℃-结盐-CO_(2)/O_(2)多因素耦合环境下呈现良好的防腐性能。The applicability of hot-dip aluminum(HDA)coating in oilfield reboiler tube bundles is studied by means of micro-morphological observation,polarization curve test,and 240℃-salt deposited-CO_(2)/O_(2)multi-degree coupling environment simulation testing in this work.The HDA sample is mainly composed of pure Al outer layer and tongue-shaped Fe_(2)Al_(5)inner alloy layer,and the thickness is between 150 and 200μm.The polarization curves,which measured at 30℃in simulated oilfield water,show that the corrosion current density of the HDA sample is about 300 times lower than that of 20#,and display excellent corrosion resistance.The simulated results at high-temperature-high-pressure environment show that the uniform corrosion rate of 20#steel in extreme environment is 0.68±0.04 mm/a,the maximum pitting depth is 70.5μm in 240℃-salt deposited-CO_(2)/O_(2)multi-degree coupling environment.In addition,the corrosion scales formed on the surface are consisted Fe_(3)O_(4) and Fe_(2)O_(3),and some cracks can be detected in the scales.However,the corrosion rate of the hot-dip aluminum coating is 0.08±0.02 mm/a,the corrosion mainly occurs in the pure Al layer,and the corresponding corrosion scale is Al(OH)_(3) after simulated testing.The comprehensive results show that the hot-dip aluminum coating exhibits excellent anti-corrosion performance under this complex environment.

关 键 词：热浸铝 20#钢 换热管束 电化学测试 高温高压模拟试验 

分 类 号：TG174.4[金属学及工艺—金属表面处理]