低压冷喷涂制备Al（Y）-30%Al2O3涂层及其海水腐蚀行为  

Corrosion Behavior of Al（Y）-30%Al2O3 Coating Fabricated by Low Pressure Cold Spray Technology

作　　者：白杨 王振华 李相波 李焰 BAI Yang;WANG Zhenhua;LI Xiangbo;LI Yan(School of Materials Science and Engineering,China University of Petroleum,Qingdao 266580,China;State Key Laboratory of Marine Coatings,Marine Chemical Research Institute Co. ,Ltd. ,Qingdao 266071,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China)

机构地区：[1]中国石油大学(华东)材料科学与工程学院,青岛266580 [2]海洋化工研究院有限公司海洋涂料国家重点实验室,青岛266071 [3]海洋腐蚀与防护重点实验室中船重工七二五所,青岛266237

出　　处：《金属学报》2019年第10期1338-1348,共11页Acta Metallurgica Sinica

基　　金：中央高校基本科研专项资金项目No.18CX05021A;山东省重点研发计划项目No.2017GHY15108;青岛市博士后应用研究项目~~

摘　　要：采用低压冷喷涂技术在Q235碳钢基体上制备了不同稀土元素(Y)添加量的Al(Y)-30%Al2O3(体积分数)复合涂层。结合SEM、XRD、FTIR等材料分析测试手段,采用开路电位、交流阻抗、动电位极化等电化学测试方法对涂层的腐蚀行为进行了研究。通过考察不同稀土元素(Y)添加含量对涂层微观组织和腐蚀电化学行为的影响,研究复合涂层的腐蚀机制。结果表明:添加适量的Y元素可以提高涂层的耐蚀性能,加入量过少,Y作用不明显;加入量过多,涂层的耐蚀性有所下降;当Y添加量为0.2%(质量分数)时,涂层的耐蚀性比Al-30%Al2O3涂层提高了1个数量级;Al(Y)-30%Al2O3涂层的腐蚀过程包括:表层均匀腐蚀、界面侵蚀-渗透扩散、局部腐蚀、腐蚀抑制4个阶段。Low-pressure cold spray technology(LPCS) is a new type of surface treatment technology. Compared with the conventional thermal sprayed aluminum coating, the LPCS aluminum coating has the advantages of a low degree of oxidation, high density and good resistance to uniform corrosion. However, the inert aluminum coating is not stable in marine environment, it is prone to localized corrosion,which leads to coating failure. Therefore, in order to solve the key common problems of corrosion, whichare common in offshore oil and gas equipments, such as deep-sea drilling rigs, platforms and on-line storage and offloading devices, the corrosion resistance performance of the low pressure cold sprayed Al(Y)-30%Al2 O3(volume fraction) composite coatings were carried out. In this work, Al(Y)-30%Al2 O3 composite coating with different rare earth elements(Y) was prepared on the Q235 carbon steel substrate by low pressure cold spray technology, aiming to improve the local corrosion resistance performance of aluminum coating in marine environment. The effects of Y addition on the corrosion behavior of Al(Y)-30%Al2O3 coating with different Y contents(mass fraction: 0.05%, 0.1%, 0.2%, 0.5%) were studied by electrochemical measurements and microstructural analysis. The corrosion mechanism of the composite coating was elucidated. The results show that the addition of an appropriate amount of Y element is very important to improve the corrosion resistance of the coating;whether the addition amount of Y is too low or too high,the improvement can be negligible or even negative;the optimal amount of Y is 0.2%(mass fraction), by which the corrosion resistance of the coating is one order of magnitude higher than that of Al-30%Al2O3 coating;the corrosion process of Al(Y)-30%Al2O3 coating includes four stages: the surface uniform corrosion, the interfacial erosion-infiltration diffusion, the localized corrosion and the corrosion inhibition.

关 键 词：低压冷喷涂 铝基复合涂层 电化学阻抗谱 腐蚀行为 

分 类 号：TG174[金属学及工艺—金属表面处理]