Preparation and Properties of Mo/Ti/Sn Conductivity Conversion Coatings on 6063 Aluminum Alloy

IF 1.6 4区化学 Q4 CHEMISTRY, PHYSICAL Surface and Interface Analysis Pub Date : 2024-09-03 DOI:10.1002/sia.7352

Aihua Yi, Min Liu, Wenfang Li, Yuying Liu, Yeping Mo, Zhiquan Huang, Xiaolan Chen

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Abstract

Conductivity chromium‐free conversion coatings on aluminum substrates were achieved by utilizing Na2SnO3 and Mo/Ti solutions. The composition and morphology of the coatings were characterized using XPS, SEM, EDS, AFM, and Raman spectroscopies. The corrosion behavior of the coatings in 3.5‐wt% NaCl solution was investigated through a dynamic potential polarization method and EIS analysis. Mott–Schottky and UV–Vis analyses were used to determine the semiconductor properties of the coatings, including carrier concentration and band gap. The results revealed that the main components of the coating were Al2O3, SnO2, MoO3, and MoO2 and the coating presented a double‐layer structure, including a transition layer close to the substrate and a compact layer on the surface. The coating also exhibited the properties of a p‐type semiconductor. The electrical contact resistance value of adding Na2SnO3 decreased from 0.4331 to 0.1343 Ω/in2 (in 200 psi), while the band gap decreased from 2.281 to 2.232 eV.

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6063 铝合金上的钼/钛/硒导电转换涂层的制备与性能

利用 Na2SnO3 和 Mo/Ti 溶液在铝基板上实现了导电性无铬转换涂层。利用 XPS、SEM、EDS、AFM 和拉曼光谱对涂层的成分和形貌进行了表征。通过动电势极化法和 EIS 分析，研究了涂层在 3.5 wt% 的 NaCl 溶液中的腐蚀行为。莫特-肖特基分析和紫外-可见光分析用于确定涂层的半导体特性，包括载流子浓度和带隙。结果表明，涂层的主要成分是 Al2O3、SnO2、MoO3 和 MoO2，涂层呈现双层结构，包括靠近基底的过渡层和表面的致密层。涂层还具有 p 型半导体的特性。加入 Na2SnO3 的接触电阻值从 0.4331 Ω/in2 降至 0.1343 Ω/in2（200 psi），而带隙则从 2.281 eV 降至 2.232 eV。

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来源期刊

Surface and Interface Analysis 化学-物理化学

CiteScore

3.30

自引率

5.90%

发文量

130

审稿时长

4.4 months

期刊介绍： Surface and Interface Analysis is devoted to the publication of papers dealing with the development and application of techniques for the characterization of surfaces, interfaces and thin films. Papers dealing with standardization and quantification are particularly welcome, and also those which deal with the application of these techniques to industrial problems. Papers dealing with the purely theoretical aspects of the technique will also be considered. Review articles will be published; prior consultation with one of the Editors is advised in these cases. Papers must clearly be of scientific value in the field and will be submitted to two independent referees. Contributions must be in English and must not have been published elsewhere, and authors must agree not to communicate the same material for publication to any other journal. Authors are invited to submit their papers for publication to John Watts (UK only), Jose Sanz (Rest of Europe), John T. Grant (all non-European countries, except Japan) or R. Shimizu (Japan only).