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The internal microstructuresMicrostructure of Ni–P-plated Al–Zn–Mg-based alloys were investigated using synchrotron X-ray computed tomography, together with various analytical methods for hydrogenHydrogen detection. We clarified that hydrogenHydrogen-induced nano/micropores were generated and segregated near the top and bottom surfacesSurface of a rolled sheet of a commercial-purity Al–Zn–Mg-based alloy with Ni–P plating. In contrast, such segregation of hydrogenHydrogen micropores was not observed in the high-purity-grade Al–Zn–Mg alloys with Ni–P plating. This suggests that hydrogenHydrogen enters the Ni–P plating layer during the plating operation and generates poresPore in the surfaceSurface region owing to surfaceSurface inclusionsInclusions. Additionally, the hydrogenHydrogen-induced defects deteriorated the tensile properties such as tensile strengthTensile strength and elongation of the commercial-purity Al–Zn–Mg-based alloys containing higher levels of impuritiesImpurities such as Fe and Si with Ni–P plating.

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Evaluation of Hydrogen-Induced Pores in Ni–P-Plated Al–Zn–Mg Alloys Using Synchrotron X-Ray Computed Tomography and Hydrogen Analysis

  • 会议论文

  • 发表日期：

    2025年

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  • Keitaro Horikawa,
  • Makoto Hino,
  • Masato Hoshino,
  • Kentaro Uesugi

摘要

The internal microstructuresMicrostructure of Ni–P-plated Al–Zn–Mg-based alloys were investigated using synchrotron X-ray computed tomography, together with various analytical methods for hydrogenHydrogen detection. We clarified that hydrogenHydrogen-induced nano/micropores were generated and segregated near the top and bottom surfacesSurface of a rolled sheet of a commercial-purity Al–Zn–Mg-based alloy with Ni–P plating. In contrast, such segregation of hydrogenHydrogen micropores was not observed in the high-purity-grade Al–Zn–Mg alloys with Ni–P plating. This suggests that hydrogenHydrogen enters the Ni–P plating layer during the plating operation and generates poresPore in the surfaceSurface region owing to surfaceSurface inclusionsInclusions. Additionally, the hydrogenHydrogen-induced defects deteriorated the tensile properties such as tensile strengthTensile strength and elongation of the commercial-purity Al–Zn–Mg-based alloys containing higher levels of impuritiesImpurities such as Fe and Si with Ni–P plating.