Scholarlink

<p>In this paper, the effects of five different acid etching pretreatments on the properties of micro-arc oxidation (MAO) coatings were systematically investigated. The results demonstrate that acid etching pretreatment can reduce the porosity of the MAO coating from 6.82 to 5.89%. The five acids demonstrate two distinct types of surface action mechanisms. The content of the second phase on the magnesium alloy surface was reduced through treatment with citric acid, phosphoric acid, and nitric acid. Subsequently, a thin film was formed on the second phase of the magnesium alloy surface following pretreatment with hydrofluoric acid and phytic acid. The both types of acid etching pretreatments can render the substrate surface state more uniform, thereby reducing the likelihood of B-type discharge and minimizing the formation of penetration pores. Consequently, this enhances the interfacial bonding of the coating. The acid concentration, treatment duration, and treatment temperature significantly influence the properties of MAO coatings following five acid etching pretreatments. Among these factors, the acid concentration and treatment duration significantly influence the coating following citric acid pretreatment. The acid concentration and treatment temperature significantly influence the coating following hydrofluoric acid pretreatment. For phosphoric acid pretreatment, the acid concentration, treatment time and treatment temperature all affect the improvement of the coating, with treatment temperature being the most influential factor. The acid concentration exerted the most significant impact on the coating following phytic acid pretreatment. For nitric acid pretreatment, both acid concentration and treatment temperature played crucial roles in improving the coating.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of Surface Modification on the Interfacial Properties Between MAO Coatings and ZM5

  • 期刊论文

  • 发表日期：

    2025年3月5日

查看全文
  • Dongdong Song,
  • Dong Xu,
  • Jianpeng Li,
  • Qian Zhou,
  • Yuqian Zheng,
  • Zhiyuan Cui,
  • Hongxia Wan

摘要

In this paper, the effects of five different acid etching pretreatments on the properties of micro-arc oxidation (MAO) coatings were systematically investigated. The results demonstrate that acid etching pretreatment can reduce the porosity of the MAO coating from 6.82 to 5.89%. The five acids demonstrate two distinct types of surface action mechanisms. The content of the second phase on the magnesium alloy surface was reduced through treatment with citric acid, phosphoric acid, and nitric acid. Subsequently, a thin film was formed on the second phase of the magnesium alloy surface following pretreatment with hydrofluoric acid and phytic acid. The both types of acid etching pretreatments can render the substrate surface state more uniform, thereby reducing the likelihood of B-type discharge and minimizing the formation of penetration pores. Consequently, this enhances the interfacial bonding of the coating. The acid concentration, treatment duration, and treatment temperature significantly influence the properties of MAO coatings following five acid etching pretreatments. Among these factors, the acid concentration and treatment duration significantly influence the coating following citric acid pretreatment. The acid concentration and treatment temperature significantly influence the coating following hydrofluoric acid pretreatment. For phosphoric acid pretreatment, the acid concentration, treatment time and treatment temperature all affect the improvement of the coating, with treatment temperature being the most influential factor. The acid concentration exerted the most significant impact on the coating following phytic acid pretreatment. For nitric acid pretreatment, both acid concentration and treatment temperature played crucial roles in improving the coating.