Purpose

This paper aims to verify the inhibition of the hydrogen permeation effect of the coating and to quantitatively and qualitatively characterize the coating-induced stress.

Design/methodology/approach

By means of slow strain rate tensile testing (SSRT) in humid air, thickness measurement, fracture morphology, cross-section morphology and surface morphology, hydrogen content measurements, flow stress difference method.

Findings

The results demonstrate that the mechanism of the inhibition of hydrogen embrittlement by the coating is mainly attributed to the repression of hydrogen permeation and the additional coating-induced compressive stress.

Originality/value

It is proven that the micro-arc oxidation (MAO) coating does inhibit hydrogen entry into the alloy, and the stress induced by the MAO coating is compressive stress, which can restrain the hydrogen embrittlement of the alloy. Therefore, the mechanism of the inhibition of hydrogen embrittlement is dominated by the mechanisms of both hydrogen permeation inhibition and coating-induced stress.

中文翻译：

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MAO涂层抑制湿空气中7050铝合金氢脆的研究。

目的

本文旨在验证涂层对氢渗透作用的抑制作用，并定量和定性地表征涂层引起的应力。

设计/方法/方法

通过在潮湿空气中的慢应变速率拉伸试验（SSRT），厚度测量，断裂形态，横截面形态和表面形态，氢含量测量，流动应力差法。

发现

结果表明，涂​​层抑制氢脆的机理主要归因于氢渗透的抑制和附加的涂层诱导的压应力。

创意/价值

事实证明，微弧氧化（MAO）涂层的确抑制了氢进入合金，并且MAO涂层引起的应力为压应力，可以抑制合金的氢脆。因此，抑制氢脆的机理由抑制氢渗透和涂层引起的应力的机理决定。