Influences of Sc(NO3)3 on characteristics of micro-arc oxidation coatings

IF 2.4 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Surface Engineering Pub Date : 2023-03-04 DOI:10.1080/02670844.2023.2212948

Shaolan Yang, Ping Wang, Jiwei Liu

{"title":"Influences of Sc(NO3)3 on characteristics of micro-arc oxidation coatings","authors":"Shaolan Yang, Ping Wang, Jiwei Liu","doi":"10.1080/02670844.2023.2212948","DOIUrl":null,"url":null,"abstract":"ABSTRACT Micro-arc oxidation (MAO) coatings were fabricated on 2195 aluminium-lithium alloy substrate, using a silicate and phosphate electrolyte with variable scandium nitrate (Sc(NO3)3) concentrations. The properties of the coatings were analysed by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical workstation. The comprehensive analysis demonstrates that adding proper amount of Sc(NO3)3 increased the oxidation voltage, which transformed the worm shape discharge micropores into round-hole shape, and the MAO coatings presented a double-layer structure. The primary phase composition of the coatings was γ-Al2O3, α-Al2O3, Sc2O3 and Al3Sc. The optimum concentration of Sc(NO3)3 was 0.6 g L−1. The hardness reached a maximum value of (1284 ± 43.5) HV, which was about 2.5 times higher than that without adding. The self-corrosion current density reduced from 138.00 × 10− 7 A cm−2 (substrate) to 3.65 × 10− 7 A cm−2, which was approximately two orders of magnitude lower, indicating that the corrosion resistance was improved.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":"39 1","pages":"307 - 314"},"PeriodicalIF":2.4000,"publicationDate":"2023-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Engineering","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1080/02670844.2023.2212948","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}

引用次数: 0

Abstract

ABSTRACT Micro-arc oxidation (MAO) coatings were fabricated on 2195 aluminium-lithium alloy substrate, using a silicate and phosphate electrolyte with variable scandium nitrate (Sc(NO3)3) concentrations. The properties of the coatings were analysed by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical workstation. The comprehensive analysis demonstrates that adding proper amount of Sc(NO3)3 increased the oxidation voltage, which transformed the worm shape discharge micropores into round-hole shape, and the MAO coatings presented a double-layer structure. The primary phase composition of the coatings was γ-Al2O3, α-Al2O3, Sc2O3 and Al3Sc. The optimum concentration of Sc(NO3)3 was 0.6 g L−1. The hardness reached a maximum value of (1284 ± 43.5) HV, which was about 2.5 times higher than that without adding. The self-corrosion current density reduced from 138.00 × 10− 7 A cm−2 (substrate) to 3.65 × 10− 7 A cm−2, which was approximately two orders of magnitude lower, indicating that the corrosion resistance was improved.

查看原文本刊更多论文

Sc(NO3)3对微弧氧化涂层性能的影响

采用扫描电子显微镜(SEM)、x射线衍射仪(XRD)、x射线光电子能谱仪(XPS)和电化学工作站对涂层的性能进行了分析。综合分析表明，加入适量的Sc(NO3)3可以提高氧化电压，使氧化膜的蜗杆状放电微孔转变为圆孔状放电微孔，氧化膜呈现双层结构。涂层的主要相组成为γ-Al2O3、α-Al2O3、Sc2O3和Al3Sc。Sc(NO3)3的最佳浓度为0.6 g L−1。硬度最大值为(1284±43.5)HV，是未添加时的2.5倍左右。自腐蚀电流密度从138.00 × 10−7 A cm−2(衬底)降低到3.65 × 10−7 A cm−2，降低了约2个数量级，表明耐蚀性得到了提高。

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

Surface Engineering 工程技术-材料科学：膜

CiteScore

5.60

自引率

14.30%

发文量

审稿时长

2.3 months

期刊介绍： Surface Engineering provides a forum for the publication of refereed material on both the theory and practice of this important enabling technology, embracing science, technology and engineering. Coverage includes design, surface modification technologies and process control, and the characterisation and properties of the final system or component, including quality control and non-destructive examination.