Purpose

This paper aims to find a way to improve the surface insulation, corrosion resistance and mechanical properties of Fe-Cr-Al electrothermal alloy, exploring the best oxidation condition and analyzing the oxidation mechanism.

Design/methodology/approach

Electrochemical workstation was used for anodic oxidation, and the effect of current density, ethylene glycol concentration and oxidation time on properties of the film were investigated by resistivity test, scanning electron microscope, electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) and mechanical tests, and the oxidation process was analyzed by X-ray photoelectron spectroscopy (XPS).

Findings

According to the potential-time curves of anodic oxidation and the analysis of XPS, the whole oxidation process can be divided into four stages. When the current density is 0.8 A/dm², the ethylene glycol concentration is 10%, and the oxidation time is 60 min, the film has the best corrosion protection, mechanical properties and surface morphology. The resistivity of the samples is about 13 orders magnitude than that of the matrix.

Originality/value

In this paper, a protective electrically insulating film was prepared by anodic oxidation in an alkaline electrolyte solution. The oxidation conditions were optimized and the oxidation mechanism was analyzed.

中文翻译：

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Fe-Cr-Al合金表面阳极氧化膜的制备与性能

目的

本文旨在寻找一种改善Fe-Cr-Al电热合金的表面绝缘性，耐蚀性和机械性能的方法，探索最佳的氧化条件并分析其氧化机理。

设计/方法/方法

使用电化学工作站进行阳极氧化，并通过电阻率测试，扫描电子显微镜，电化学测试（电动力极化和电化学阻抗谱）和机械测试研究电流密度，乙二醇浓度和氧化时间对薄膜性能的影响，用X射线光电子能谱（XPS）分析了氧化过程。

发现

根据阳极氧化的电位-时间曲线和XPS的分析，整个氧化过程可分为四个阶段。当电流密度为0.8 A / dm ^2时，乙二醇浓度为10％，氧化时间为60 min，该膜具有最佳的防腐性能，机械性能和表面形态。样品的电阻率比基质的电阻率大约13个数量级。

创意/价值

在本文中，通过在碱性电解液中进行阳极氧化来制备保护性电绝缘膜。优化了氧化条件，分析了氧化机理。