Formation and characterization of zirconium based conversion film on AZ31 magnesium alloy

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-09-17 DOI:10.1088/2053-1591/ad7811

Hailuo Fu, Dali Wei, Chenghao Zhu, Shuyang Liu and Qing Lin

{"title":"Formation and characterization of zirconium based conversion film on AZ31 magnesium alloy","authors":"Hailuo Fu, Dali Wei, Chenghao Zhu, Shuyang Liu and Qing Lin","doi":"10.1088/2053-1591/ad7811","DOIUrl":null,"url":null,"abstract":"Magnesium alloys have great potential in biomedical applications due to their unique combination of satisfactory mechanical property and decent biodegradability. However, their poor corrosion resistance limits their applications in biomedical fields. In this work, we employ a chemical conversion deposition method to prepare a Zr-based conversion film on the surface of AZ31 magnesium alloy to serve as a passivation layer. The mechanism for the film formation was studied and it showed the deposition process consists of four steps: substrate dissolution, nucleation, film growth, and film equilibrium. The film is mainly composed of Zr(OH)4/ZrO and Mg(OH)2/MgO with small amount of MgF2 and ZrF4. The protective performance of the Zr-based film was investigated by electrochemical and immersion tests in simulated body fluid (SBF). Electrochemical results showed a significant decrease in the corrosion current density (Icorr), a positive shift of corrosion potential (Ecorr), a bigger capacitive loop diameter and higher impedance values for the Zr-coated substrate as compared with an uncoated one. Immersion results indicated the corrosion rate of the Zr-coated sample was ∼20% lower than that of an uncoated one. All above results corroborate the great potential of Zr-based coating in enabling AZ31 alloy for biomedical applications.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Research Express","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1088/2053-1591/ad7811","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Magnesium alloys have great potential in biomedical applications due to their unique combination of satisfactory mechanical property and decent biodegradability. However, their poor corrosion resistance limits their applications in biomedical fields. In this work, we employ a chemical conversion deposition method to prepare a Zr-based conversion film on the surface of AZ31 magnesium alloy to serve as a passivation layer. The mechanism for the film formation was studied and it showed the deposition process consists of four steps: substrate dissolution, nucleation, film growth, and film equilibrium. The film is mainly composed of Zr(OH)4/ZrO and Mg(OH)2/MgO with small amount of MgF2 and ZrF4. The protective performance of the Zr-based film was investigated by electrochemical and immersion tests in simulated body fluid (SBF). Electrochemical results showed a significant decrease in the corrosion current density (Icorr), a positive shift of corrosion potential (Ecorr), a bigger capacitive loop diameter and higher impedance values for the Zr-coated substrate as compared with an uncoated one. Immersion results indicated the corrosion rate of the Zr-coated sample was ∼20% lower than that of an uncoated one. All above results corroborate the great potential of Zr-based coating in enabling AZ31 alloy for biomedical applications.

查看原文本刊更多论文

AZ31 镁合金上锆基转化膜的形成与表征

镁合金具有令人满意的机械性能和良好的生物降解性，因此在生物医学应用中具有巨大的潜力。然而，镁合金较差的耐腐蚀性限制了其在生物医学领域的应用。在这项工作中，我们采用化学转化沉积法在 AZ31 镁合金表面制备了一层 Zr 基转化膜作为钝化层。对薄膜的形成机理进行了研究，结果表明沉积过程包括四个步骤：基底溶解、成核、薄膜生长和薄膜平衡。薄膜主要由 Zr(OH)4/ZrO 和 Mg(OH)2/MgO 以及少量 MgF2 和 ZrF4 组成。通过在模拟体液（SBF）中进行电化学和浸泡试验，研究了锆基薄膜的保护性能。电化学结果表明，与未涂覆的基底相比，涂覆 Zr 的基底的腐蚀电流密度（Icorr）明显降低，腐蚀电位（Ecorr）呈正向移动，电容环直径更大，阻抗值更高。浸泡结果表明，涂有 Zr 的样品的腐蚀速率比未涂 Zr 的样品低 20%。所有上述结果都证实了锆基涂层在 AZ31 合金生物医学应用中的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.