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题名: Microstructure and Corrosion Resistance Studies of PEO Coated Mg Alloys with a HF and US Pretreatment
作者: Wei, Fangfang;  Zhang, Wei;  Zhang, Tao;  Wang, Fuhui
发表日期: 2017
摘要: The effect of hydrofluoric acid (HF) pretreatment on the microstructure and corrosion resistance of PEO coatings on AZ91 Mg alloys was investigated. The results showed that thin fluoride film was formed on AZ91 Mg alloy after pretreatment. The application of ultrasound (US) in the pretreatment made the film more compact and increased its F content. PEO coatings deposited on the pretreated AZ91 become denser with decreased porosity level and have no structural defects. The inner layer (IL) of PEO coating of HF-treated AZ91 with US is more intact and contains more F than those obtained without US. The better quality of IL could facilitate the stable discharge and form compact PEO coating. Therefore, PEO coating deposited on AZ91 pretreated with (HF+US) offered a better corrosion resistance, which is in good agreement with the results of electrochemical measurements.
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Recommended Citation:
Wei, Fangfang,Zhang, Wei,Zhang, Tao,et al. Microstructure And Corrosion Resistance Studies Of Peo Coated Mg Alloys With A Hf And Us Pretreatment[J]. International Journal Of Electrochemical Science,2017,12(1):155-165.

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