Enhanced corrosion resistance of porous microarc oxidation coating sealed with electroless nickel plating under pressure impregnation
Enhanced corrosion resistance of porous microarc oxidation coating sealed with electroless nickel plating under pressure impregnation
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DOI：
10.1016/j.matlet.2022.131944
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发表时间：
2022-05
影响因子：
3
通讯作者：
Tong Zhou;Xinwen Zhang;Ruoyun Wang;Fei Long;Xuan Li;Lei Liu
中科院分区：
文献类型：
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作者：
Tong Zhou;Xinwen Zhang;Ruoyun Wang;Fei Long;Xuan Li;Lei Liu
微弧氧化（MAO）膜层由于其固有的缺陷结构而不能最大限度地发挥其抗腐蚀能力，进一步封孔处理是提高其抗腐蚀能力的主流策略。在此，压力浸渍下的化学镀镍被证明是显著有效的，以弥补多孔微弧氧化涂层的缺陷，微弧氧化涂层中的空隙和裂纹被Ni很好地填充，导致腐蚀性Cl−离子的侵入路径被阻断，并且金属基体的电离不能发生，微弧氧化膜的电阻率为100%左右，微弧氧化膜中的电子几乎不向基体传递，因此微弧氧化膜的耐腐蚀性能明显提高。
The corrosion protection ability of the microarc oxidation (MAO) coating cannot be maximized due to its inherent defective structure, and further hole sealing treatment has been a prevailing strategy for enhancing the corrosion resistance. Herein, the electroless Ni plating under pressure impregnation was demonstrated to be significantly effective to remedy the defects of the porous MAO coating, the voids and cracks in the MAO coating were filled with Ni well, resulting in the blockage of the invasive route of the corrosive Cl−ions, and the ionization of the metal matrix was unable to occur, the MAO coating with ultrahigh electrical resistivity hardly transferred the electron from the Ni layer to substrate, hence, the corrosion property of the MAO coating was obviously enhanced.