低压冷喷涂制备Al(Y)-30%Al2O3涂层及其海水腐蚀行为

doi:10.11900/0412.1961.2019.00047

金属学报

2019, Vol. 55

Issue (10): 1338-1348 DOI: 10.11900/0412.1961.2019.00047

本期目录 | 过刊浏览

低压冷喷涂制备Al(Y)-30%Al₂O₃涂层及其海水腐蚀行为

白杨^1,²,王振华³,李相波³,李焰¹(

)

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

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

BAI Yang^1,²,WANG Zhenhua³,LI Xiangbo³,LI Yan¹(

)

1. School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, China
2. State Key Laboratory of Marine Coatings, Marine Chemical Research Institute Co. , Ltd. , Qingdao 266071, China
3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China

引用本文:

白杨, 王振华, 李相波, 李焰. 低压冷喷涂制备Al(Y)-30%Al₂O₃涂层及其海水腐蚀行为[J]. 金属学报, 2019, 55(10): 1338-1348.
Yang BAI, Zhenhua WANG, Xiangbo LI, Yan LI. Corrosion Behavior of Al(Y)-30%Al₂O₃ Coating Fabricated by Low Pressure Cold Spray Technology[J]. Acta Metall Sin, 2019, 55(10): 1338-1348.

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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。

关键词 ：低压冷喷涂, 铝基复合涂层, 电化学阻抗谱, 腐蚀行为

Abstract：

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, which are 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%Al₂O₃ (volume fraction) composite coatings were carried out. In this work, Al(Y)-30%Al₂O₃ 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.

Key words： low pressure cold spray aluminum matrix composite coating electrochemical impedance spectroscopy corrosion behavior

收稿日期: 2019-02-22

ZTFLH:

TG174

基金资助:中央高校基本科研专项资金项目(18CX05021A);山东省重点研发计划项目(2017GHY15108);青岛市博士后应用研究项目

作者简介: 白杨，女，1990年生，工程师，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00047 或 https://www.ams.org.cn/CN/Y2019/V55/I10/1338

图1 不同Y含量Al(Y)-30% Al2O3 (体积分数)涂层的表面形貌

图2 不同Y含量Al(Y)-30%Al2O3涂层的截面形貌

图3 不含和含0.1%Y的Al(Y)-30% Al2O3涂层横截面抛光刻蚀后的SEM像

图4 不同Y含量Al(Y)-30% Al2O3涂层随浸泡时间的开路电位(Eocp)变化曲线

图 5 不同Y含量Al(Y)-30%Al2O3涂层在海水中浸泡不同时间的Nyquist图

图 6 不同Y含量Al(Y)-30%Al2O3涂层在海水中浸泡不同时间的Bode图

图7 不同Y含量Al(Y)-30%Al2O3涂层在海水中浸泡720 h的EIS

图8 不同Y添加量Al(Y)-30%Al2O3涂层在海水中浸泡720 h后的动电位极化曲线

表1 不同Y添加量Al(Y)-30%Al2O3涂层在海水中浸泡720 h后的动电位极化拟合结果

图9 Al(Y)-30% Al2O3涂层在海水中浸泡1440 h后的XRD谱

图10 浸泡前和在海水中浸泡1440 h后Al(Y)-30%Al2O3涂层腐蚀表面元素分布

图11 在海水中浸泡1440 h后Al(Y)-30%Al2O3涂层表面腐蚀产物的Fourier红外光谱

图12 Al(Y)-30%Al2O3涂层在海水中浸泡1440 h后腐蚀表面的SEM像

图13 低压冷喷涂Al(Y)- 30%Al2O3涂层的腐蚀机制示意图

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