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03-20
2021
Main Factors Causing Non-Uniform Oxide Film Color in Door and Window Profiles
During the coloring process for window and door profiles, excessive swinging within the plating tank can lead to uneven contact between the solution and the profile—particularly between the edges and the center—resulting in inconsistent coloration of the oxide film on the surface. Additionally, during the fabrication of aluminum-clad window and door profiles, localized damage to the cladding layer can occur; since the outer cladding is high-grade aluminum while the underlying core is mixed-grade aluminum, the significant difference in material properties accelerates oxidation, causing mottling on the profile surface. Such defects are often difficult for customers to understand or accept, so it is essential to clearly explain the root causes beforehand. Furthermore, operational issues in the anodizing process—such as incomplete alkaline etching, residual alkalinity on the profile surface, or failure to perform post-etch polishing—can also give rise to similar problems. To address these challenges, we must identify the underlying causes and implement targeted corrective measures. For instance, by controlling the amplitude of profile movement within the plating tank, we can effectively prevent uneven coloration of the surface oxide film.
Henan Mingmei Magnesium Technology Co., Ltd.
Phone:+86-392-3658888 / 3659999
Email:hnmingmei@163.com
Address: Hebi National Economic and Technological Development Zone, Henan Province
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