Analysis of surface treatment technology before aluminum and aluminum alloy coating

China Aluminium Network reports that chemical conversion coating is widely used in the anti-corrosion surface treatment of aluminum and its alloys. Over the past half-century, this process has matured significantly and continues to evolve, leading to new and improved treatment methods. While chemical oxidation will remain an important technique in the future, increasing environmental concerns have raised the standards for cleanliness and non-pollution in surface treatment processes. To address these challenges, several improvements are being explored.

Firstly, low-temperature metal surface pretreatment has emerged as an energy-efficient alternative. This method reduces energy consumption while maintaining effective surface preparation. Secondly, there's a growing focus on low-chromium or chromium-free treatments. These alternatives aim to minimize the use of toxic heavy metals, which are harmful to both the environment and human health.

Thirdly, waterless washing treatment is gaining attention. This approach eliminates the need for water-based rinsing steps entirely, not only solving the issue of wastewater pollution but also conserving water resources. For instance, in Japan, chromic acid-based surface treatment agents—composed of Cr³⁺, Cr⁶⁺, and water-soluble organic resins—are used for aluminum plates through a spraying method. This process does not require rinsing, and even if chromium ions are present, they do not pollute the environment. The film dries naturally, making it easy to integrate into closed-loop systems. The corrosion resistance and adhesion properties of the resulting film are comparable to or better than those of traditional methods.

Lastly, the pre-treatment and film formation stages can be integrated into a closed-loop system. In such a setup, all chemical solutions are recycled, reducing the need for frequent replacement of the original liquid. Only small amounts of consumables are added periodically. Whether using a washing or waterless method, the system can still achieve proper sealing. A closed-loop process significantly improves the working environment, minimizes waste discharge, and saves energy and resources. The economic, social, and environmental benefits of this approach are substantial and increasingly recognized in the industry.

Stainless Steel Precision Machining Components

Stainless Steel Precision Machining Components,Stainless Steel Cnc Machining Parts,Cnc Machining Stainless Steel Parts,High Precision Machining Part

Stand Dragon Industrial Co., Ltd. , https://www.standdragontw.com