Chao Yang , Tao Ying , Aihui Huang , Jian Huang , Pinghu Chen , Paul K. Chu , Xiaoqin Zeng
{"title":"原位共掺杂磷酸锌和磷酸铈增强LY12铝合金MAO涂层的耐蚀性","authors":"Chao Yang , Tao Ying , Aihui Huang , Jian Huang , Pinghu Chen , Paul K. Chu , Xiaoqin Zeng","doi":"10.1016/j.corcom.2024.10.001","DOIUrl":null,"url":null,"abstract":"<div><div>Corrosion of aluminum (Al) alloys during service limits many applications. Micro-arc oxidation (MAO) coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated <em>in situ</em> to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn<sup>2+</sup> is released and deposited as corrosion products Zn(OH)<sub>2</sub> to cover weak corrosion micro-regions in the coating. Simultaneously, Ce<sup>3+</sup> released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn(OH)<sub>2</sub>/Ce(OH)<sub>3</sub> due to the small solubility product <em>K</em><sub>sp</sub> to further enhance corrosion resistance. Compared to pristine Al alloy, corrosion potential increases from -1.306 to -0.819 V<sub>SCE</sub>, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10<sup>−6</sup> to 2.5 × 10<sup>−10</sup> A·cm<sup>−2</sup>. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.</div></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"17 ","pages":"Pages 35-43"},"PeriodicalIF":0.0000,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhancing corrosion resistance of MAO coatings on Al alloy LY12 through in situ co-doping with zinc phosphate and cerium phosphate\",\"authors\":\"Chao Yang , Tao Ying , Aihui Huang , Jian Huang , Pinghu Chen , Paul K. Chu , Xiaoqin Zeng\",\"doi\":\"10.1016/j.corcom.2024.10.001\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Corrosion of aluminum (Al) alloys during service limits many applications. Micro-arc oxidation (MAO) coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated <em>in situ</em> to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn<sup>2+</sup> is released and deposited as corrosion products Zn(OH)<sub>2</sub> to cover weak corrosion micro-regions in the coating. Simultaneously, Ce<sup>3+</sup> released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn(OH)<sub>2</sub>/Ce(OH)<sub>3</sub> due to the small solubility product <em>K</em><sub>sp</sub> to further enhance corrosion resistance. Compared to pristine Al alloy, corrosion potential increases from -1.306 to -0.819 V<sub>SCE</sub>, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10<sup>−6</sup> to 2.5 × 10<sup>−10</sup> A·cm<sup>−2</sup>. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.</div></div>\",\"PeriodicalId\":100337,\"journal\":{\"name\":\"Corrosion Communications\",\"volume\":\"17 \",\"pages\":\"Pages 35-43\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2025-01-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Corrosion Communications\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2667266925000064\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Communications","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2667266925000064","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Enhancing corrosion resistance of MAO coatings on Al alloy LY12 through in situ co-doping with zinc phosphate and cerium phosphate
Corrosion of aluminum (Al) alloys during service limits many applications. Micro-arc oxidation (MAO) coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated in situ to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn2+ is released and deposited as corrosion products Zn(OH)2 to cover weak corrosion micro-regions in the coating. Simultaneously, Ce3+ released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn(OH)2/Ce(OH)3 due to the small solubility product Ksp to further enhance corrosion resistance. Compared to pristine Al alloy, corrosion potential increases from -1.306 to -0.819 VSCE, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10−6 to 2.5 × 10−10 A·cm−2. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.
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