Corrosion Behavior of Mg(OH)2/Mg-Al Layered Double Hydroxides/AlO(OH) Composite Film Prepared by Steam Coating on Mg Alloy AZCa612
Corrosion Behavior of Mg(OH)2/Mg-Al Layered Double Hydroxides/AlO(OH) Composite Film Prepared by Steam Coating on Mg Alloy AZCa612
复制标题
镁合金AZCa612蒸汽涂覆Mg(OH)2/Mg-Al层状双氢氧化物/AlO(OH)复合膜的腐蚀行为
DOI：
10.1149/1945-7111/ac54db
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Takahiro Ishizaki
中科院分区：
文献类型：
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作者：
Kae Nakamura;Yuma Nagashima;Hiraku Muto;Ryo Nakano;Takahiro Ishizaki
研究了AZCa612镁合金表面蒸汽涂覆耐蚀膜的腐蚀行为。通过将薄膜样品浸泡在5wt%的氯化钠水溶液中预定的时间来腐蚀薄膜样品。用扫描电子显微镜、能量色散X射线能谱、掠角X射线衍射、傅立叶变换红外光谱、动电位极化测量、产氢测量和电化学阻抗谱对腐蚀后的薄膜进行了表征。薄膜中的层状双氢氧化物(LDHs)含量从浸泡开始到浸泡后120h略有下降，此后逐渐增加。浸泡6h后形成了Mg-Al-ClLDHs，并随着浸泡时间的延长迅速长大。此外，即使薄膜的耐腐蚀性逐渐降低，也没有观察到衬底上的重大损伤。这些结果表明，腐蚀防护机制随浸泡时间的不同而不同。在较短浸泡时间下的耐蚀性能归因于Mg(OH)2和AlO(OH)的高耐蚀性，而在较长浸泡时间下则归因于镁铝氯和镁铝碳酸盐LDHs的覆盖性。
This study investigated the corrosion behavior of the corrosion-resistant films steam coated on AZCa612 magnesium alloy. The film samples were corroded by immersing them in 5 wt% NaCl aqueous solution for a predetermined time. The corroded films were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, glancing angle X-ray diffraction, Fourier transform infrared spectroscopy, potentiodynamic polarization measurements, hydrogen generation measurements, and electrochemical impedance spectroscopy. The amount of Mg–Al–CO 3 layered double hydroxides (LDHs) in the film slightly decreased from the beginning of immersion to 120 h after immersion and gradually increased thereafter. Mg–Al–Cl LDHs were formed after 6 h of immersion and rapidly grew as the immersion progressed. In addition, even with the gradual decrease in the corrosion resistance of the film, there was no major damage observed on the substrates. These results indicate that the corrosion protection mechanism varied with the immersion time. The corrosion-resistant property under a short immersion time could be attributed to the high corrosion resistance of Mg (OH) 2 and AlO (OH), whereas it is attributed to the coverage provided by the Mg–Al–Cl and Mg–Al–CO 3 LDHs under a longer immersion duration.