Scholarlink

<p>The microporosity of micro-arc oxidation (MAO) coatings hindered their application on magnesium alloys. Here, the polysilazane (PSZ) was used to seal the pores of MAO coatings by spraying, creating a corrosion-resistant MAO/PSZ composite coating on AZ31B Mg alloy. The active groups (Si–N) in the PSZ layer hydrolyzed in the presence of moisture and they typically cured at elevated temperatures to form a solid ceramic layer. Its morphology, hydrophobicity, corrosion resistance and other properties were studied in detail. The PSZ formed a hydrophobic pore-sealing layer on the MAO layer with high bond strength. Moreover, the self-corrosion current density of the coating was significantly reduced (2.95 × 10<sup>–5</sup>&#xa0;μA/cm<sup>2</sup>), indicating enhancement of the corrosion protection ability. This is attributed to the dense and strong Si–O pore-sealing layer formed by the PSZ polymer on MAO.</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

Polysilazane/micro-arc oxidation pore-sealing composite coatings to protect magnesium alloys from corrosion

  • 期刊论文

  • 发表日期：

    2025年2月7日

查看全文
  • Han Yan,
  • Xuejun Cui,
  • Hongxia Zhu,
  • Yuming Qi,
  • Xingyou Chen,
  • Qingchuan Ren

摘要

The microporosity of micro-arc oxidation (MAO) coatings hindered their application on magnesium alloys. Here, the polysilazane (PSZ) was used to seal the pores of MAO coatings by spraying, creating a corrosion-resistant MAO/PSZ composite coating on AZ31B Mg alloy. The active groups (Si–N) in the PSZ layer hydrolyzed in the presence of moisture and they typically cured at elevated temperatures to form a solid ceramic layer. Its morphology, hydrophobicity, corrosion resistance and other properties were studied in detail. The PSZ formed a hydrophobic pore-sealing layer on the MAO layer with high bond strength. Moreover, the self-corrosion current density of the coating was significantly reduced (2.95 × 10–5 μA/cm2), indicating enhancement of the corrosion protection ability. This is attributed to the dense and strong Si–O pore-sealing layer formed by the PSZ polymer on MAO.