超声波冷锻与微弧氧化处理铝合金钻杆的耐腐蚀性能  

Corrosion Performance of Aluminum Alloy Drill Pipe Treated by Ultrasonic Cold Forging and Micro Arc Oxidation

作　　者：梁健[1,2] 李嘉栋 林冰 岳文 王成彪[2] 尹浩[1] 唐鋆磊[3] LIANG Jian;LI Jia-dong;LIN Bing;YUE Wen;WANG Cheng-biao;YIN Hao;TANG Jun-lei(Institute of Exploration Techniques,Chinese Academy of Geological Sciences,Hebei Langfang 065000,China;School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国地质科学院勘探技术研究所,河北廊坊065000 [2]中国地质大学(北京)工程技术学院,北京100083 [3]西南石油大学化学化工学院,成都610500

出　　处：《表面技术》2022年第6期255-266,共12页Surface Technology

基　　金：国家自然科学基金项目(41772390);国家重点研发计划项目(2018YFC0603403)。

摘　　要：目的采用超声波冷锻与微弧氧化技术处理形成包裹于铝合金表面的细晶层和微弧氧化膜层用以提高铝合金钻杆的耐腐蚀性能。方法用超声波冷锻技术(Ultrasonic Cold Forging Technology,UCFT)和微弧氧化技术(Micro Arc Oxidation,MAO)处理形成包裹于铝合金表面的细晶层和微弧氧化膜层,从而强化铝合金钻杆材料(2024)。通过模拟铝合金材料在科学超深井“高温–高压–力学–化学”的服役条件和环境,并使用失重法、电化学方法、扫描电子显微镜以及X射线衍射等测试方法,研究了细晶层和微弧氧化膜层对铝合金钻杆腐蚀行为和腐蚀规律的影响。结果通过电化学测试结果可知,经UCFT+MAO处理的铝合金的耐腐蚀性能随着弹性拉应力的增加而逐渐下降。但在300 MPa的弹性拉应力作用下,经UCFT+MAO处理的铝合金仍能维持较低的腐蚀速率(10^(‒2) mm/a),并且耐蚀性能仍大于未经UCFT+MAO处理的铝合金。通过失重法和扫描电子显微镜测试结果可知,在100 MPa的弹性拉应力条件下,经UCFT+MAO处理的铝合金的腐蚀速率随试验温度的升高而明显上升,并且表面的腐蚀形貌也变得越来越不平整,凸起程度增加。当试验温度超过125℃时,经UCFT+MAO处理的铝合金的腐蚀速率随温度的增加而显著上升。通过XRD测试结果可知,在100 MPa的弹性拉应力和不同温度条件下,经UCFT+MAO处理的铝合金表面的化学组成主要以Al和Al^(2)O_(3)为主。结论经UCFT和MAO处理形成的细晶层和微弧氧化膜层能够有效保护铝合金基体,提升铝合金的耐腐蚀性能。To improve the corrosion resistance of aluminum alloy drill pipe,the ultrasonic cold forging and micro-arc oxidation technology are used to form the fine crystal layer of UCFT and micro-arc oxidation film layer wrapped on the aluminum alloy surface.The ultrasonic cold forging technology(UCFT)and micro arc oxidation technology(MAO)are used to form a UCFT fine-grained layer and a micro-arc oxidation film layer wrapped on the surface of the aluminum alloy to strengthen the aluminum alloy drill pipe material(2024).The influence of the UCFT fine-grained layer and the micro-arc oxidation film on the corrosion behavior and corrosion laws of aluminum alloy drill pipes are studied by simulating the service conditions and environment of aluminum alloy materials in the scientific ultra-deep well"high temperature-high pressure-mechanicschemistry",combined with weightlessness method,electrochemical method,scanning electron microscope,X-ray diffraction and other test methods.According to the electrochemical test results,the corrosion resistance of the surface-treated aluminum alloy gradually decreases with the increasing the elastic tensile stress,but under the action of elastic tensile stress of 300 MPa,the aluminum alloy treated with UCFT+MAO can still maintain a lower corrosion rate(10^(‒2) mm/a),and the corrosion resistance is still greater than that without UCFT+MAO treatment aluminum alloy;According to the test results of weight loss method and scanning electron microscope,it can be seen that under the condition of elastic tensile stress of 100 MPa,the corrosion rate of aluminum alloy treated with UCFT+MAO increases significantly with the gradual increasing the experimental temperature,and the corrosion morphology of the surface becomes more and more uneven,and the degree of protrusion increases.Moreover,when the experimental temperature increases more than 125℃,the corrosion rate of aluminum alloy treated with UCFT+MAO increases significantly with the increasing temperature.The XRD test results show that under 100 M

关 键 词：科学超深井 铝合金钻杆 超声波冷锻 微弧氧化 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]