Investigation and Performance Analysis of Color Difference of Anodizing Film on 7150 Aluminum Alloy Sheets

SHENG Yongqing; WANG Haojun; GUO Quanqing

doi:10.19554/j.cnki.1001-3563.2026.01.028

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (1) : 240-248. DOI: 10.19554/j.cnki.1001-3563.2026.01.028

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Investigation and Performance Analysis of Color Difference of Anodizing Film on 7150 Aluminum Alloy Sheets

SHENG Yongqing^*, WANG Haojun, GUO Quanqing

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Abstract

The work aims to verify whether the material meets the standard requirements for the production difficulty of inconsistent color of the chromic anodizing film layer 7150 aluminum alloy sheets after machining. Through macro and micro analysis, and energy spectrum analysis, the organization observation and film thickness detection of the machined of the aluminum alloy sheets were carried out at high and low magnifications, and the electrical conductivity, mechanical properties, chemical composition, and hardness tests of different color regions were combined to explore the cause of the color difference of the anodizing film. When the color of the anodizing film of 7150 aluminum alloy sheets varied, there was no obvious difference in chemical composition, mechanical properties, hardness, and electrical conductivity in the color difference area, and the inconsistency of the film color was related to the micro-rough of the surface. In conclusion, when the color of the anodizing film of 7150 aluminum alloy sheets varies, the chemical composition, mechanical properties, hardness and electrical conductivity of the light and dark areas are comparable, which meets the AMS4252 material technical requirements, and the micro-state of the surface is the key affecting the uniformity of the oxide film color.

Key words

7150 aluminum alloy / anodizing / color difference

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SHENG Yongqing, WANG Haojun, GUO Quanqing. Investigation and Performance Analysis of Color Difference of Anodizing Film on 7150 Aluminum Alloy Sheets[J]. Packaging Engineering. 2026, 47(1): 240-248 https://doi.org/10.19554/j.cnki.1001-3563.2026.01.028

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