A method for testing the adhesion of inorganic coatings on magnesium alloys

By combining the tear tape test with the correlation between the percentage of remaining coating area and the pull-out method, the problem of rapid and accurate detection of the adhesion of inorganic coatings on magnesium alloys was solved, enabling real-time quantification and reliable guidance on the production site.

CN120948348BActive Publication Date: 2026-07-24NORTHEASTERN UNIV CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quickly and accurately test the adhesion of inorganic coatings on magnesium alloys, especially chemical conversion and micro-arc oxidation coatings, which affects rapid process adjustments and quality control on the production site.

Method used

The inorganic coating of the magnesium alloy sample was covered with tear-off tape. The tape was removed by instantaneous impact load. The adhesion value was calculated by combining the pre-established correlation model between the percentage of remaining coating area and the pull-out test.

Benefits of technology

It enables real-time quantification of the adhesion of inorganic coatings on magnesium alloys, significantly improving detection efficiency and result reliability, and can guide process adjustments and quality control on the production site.

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Abstract

The application discloses a magnesium alloy inorganic coating adhesion test method and relates to the technical field of surface performance test. The method comprises the following steps: tape sticking: covering a tear tape on the surface of the inorganic coating of a magnesium alloy sample to be tested, and extending one end of the tear tape to form a tear section; sample positioning: fixing the magnesium alloy sample to be tested, so that the surface of the inorganic coating forms an angle of 90 degrees plus or minus 2 degrees with the direction of gravity of the magnesium alloy sample to be tested; dynamic peeling: applying a transient impact load to the tear tape through the tear section, so that the tear tape falls off and the inorganic coating is partially peeled off; and adhesion calculation: based on the percentage of the residual area of the inorganic coating, the adhesion value of the inorganic coating of the magnesium alloy sample to be tested is obtained through a pre-established corresponding relationship model between the percentage of the residual area of the inorganic coating and the adhesion value tested by the pull-out method. The application can realize instant quantification of the adhesion, the result is reliable, and the method can directly guide process adjustment and quality control on the production site.
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Citation Information

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