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首页> 美国卫生研究院文献>Materials >In Situ Scanning Electron Microscopy Observation of Crack Initiation and Propagation in Hydroxide Films Formed by Steam Coating on Aluminum-Alloy Sheets
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In Situ Scanning Electron Microscopy Observation of Crack Initiation and Propagation in Hydroxide Films Formed by Steam Coating on Aluminum-Alloy Sheets

机译：原位扫描电子显微镜观察铝合金薄板上蒸汽涂层形成的氢氧化物膜的裂纹萌生和扩展

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摘要

Hydroxide film was formed on 6061 Al-alloy (Al-1.00Mg-0.62Si(wt.%)) sheets by steam coating with the temperature of 220 °C for 24 h. During bending test of the coated specimens, the crack initiation and propagation processes in the hydroxide film were investigated using in situ SEM observations. The hydroxide film formed exhibited a dual-layer structure composed of an inner amorphous layer and an outer polycrystalline γ-AlO(OH)-phase layer. On the compressively strained surface, lateral cracks are preferentially initiated inside the inner amorphous layer, and propagate either inside this layer or on its interface with the outer γ-AlO(OH) layer. Digital image correlation analyses of the in situ observed SEM images suggested that the concentrated tensile strain along the surface normal localized at some parts of the amorphous layer could contribute to the crack initiation. On the tensile-strained surface, a number of cracks were initiated inside the inner amorphous layer along the surface normal and propagate into the outer γ-AlO(OH) layer. No cracks were found along the interface of the amorphous layer with the Al-alloy substrate. As a result, the anticorrosion hydroxide film adhered on the Al sheet after bending deformation. Such strong adhesion contributes to the excellent corrosion resistance of the Al-alloy parts provided by the steam coating.
机译：通过在220°C的温度下进行24小时的蒸汽涂覆，在6061铝合金（Al-1.00Mg-0.62Si（wt。％））板上形成氢氧化物膜。在涂层试样的弯曲试验过程中，使用原位SEM观察了氢氧化物膜的裂纹萌生和扩展过程。所形成的氢氧化物膜表现出由内部非晶层和外部多晶γ-AlO（OH）相层组成的双层结构。在压缩应变的表面上，侧向裂纹优先在内部非晶层内部引发，并在该层内部或与外部γ-AlO（OH）层的界面处扩展。对现场观察到的SEM图像进行数字图像相关性分析，结果表明，沿表面法线分布的集中拉伸应变位于非晶层的某些部位，可能有助于裂纹萌生。在拉伸应变的表面上，内部非晶态层内部沿着表面法线引发了许多裂纹，并扩展到外部γ-AlO（OH）层中。沿非晶层与铝合金基底的界面未发现裂纹。结果，弯曲变形后，耐腐蚀氢氧化物膜附着在Al片上。如此强的附着力有助于蒸汽涂层提供的铝合金零件的出色的耐腐蚀性。

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