CAJ | 학술논문

开发一种在 AZ91D 镁合金表面制备镁合金镁铝水滑石膜的电场辅助新工艺。该工艺可有效缩短镁铝水滑石转化膜的成膜时间。扫描电镜结果表明：短时间的电场辅助处理可在镁合金表面形成一层连续、致密的镁铝水滑石膜，但长时间处理会使膜层出现局部脱落现象。电场辅助处理2 h试样(EF1+1h)的腐蚀电流密度比镁合金基体低约2个数量级，交流阻抗测试和浸泡腐蚀试验结果均表明，该膜层能有效地保护镁合金。
개발일충재 AZ91D 미합금표면제비미합금미려수활석막적전장보조신공예。해공예가유효축단미려수활석전화막적성막시간。소묘전경결과표명：단시간적전장보조처리가재미합금표면형성일층련속、치밀적미려수활석막，단장시간처리회사막층출현국부탈락현상。전장보조처리2 h시양(EF1+1h)적부식전류밀도비미합금기체저약2개수량급，교류조항측시화침포부식시험결과균표명，해막층능유효지보호미합금。
A new method for synthesizing Mg?Al hydrotalcite conversion coating on AZ91D Mg alloy was developed by the application of electric field (EF). By using EF technique, the formation time of the coating can be significantly reduced. The SEM results indicate that a continuous and compact Mg?Al hydrotalcite coating is formed on the surface of Mg alloy after short time EF treatment. However, a long time treatment would make the coating partially exfoliate. The corrosion current density (Jcor ) of the coated sample (EF1+1 h) is approximately two orders of magnitude lower than that of Mg alloy substrate. The test of electrochemical impedance spectroscopy (EIS) and immersion corrosion also suggest that the coating can effectively protect Mg alloy against corrosion.