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Chrome-free surface passivation for aluminum alloys

2025-05-29

Aluminum alloys are widely used in aerospace, automotive, electronics and other fields due to their light weight, high strength and corrosion resistance. However, the traditional chromate passivation process has been strictly limited by international environmental regulations due to the high toxicity and serious pollution of hexavalent chromium. In this paper, the research on chromium-free passivation technology is carried out to explore the film-forming mechanism of silane/rare earth salt composite system, to improve the corrosion resistance of passivation film by optimizing the process parameters, and to analyze its environmental protection and economic value, so as to provide theoretical and technical references for the alternative chromate process. From this paper, we can learn: The application of aluminum is the highest production of non-ferrous metals, the most widely used metal materials. In the metal structural materials, its production is second only to steel. All-Aluminum Engines The advantage of a cast aluminum block is that it is lightweight,...

Chrome-free surface passivation for aluminum alloys

2025-03-26

Applications of Aluminum Aluminum is the most productive and widely used metallic material among non-ferrous metals. It is second only to steel in terms of production of structural metallic materials. All-aluminum engines The advantage of cast aluminum blocks in die-casting production is their light weight, which enables fuel savings through weight reduction. In an engine of the same displacement, the use of an aluminum block engine reduces weight by about 20 kilograms. For every 10% reduction in the car's own weight, fuel consumption can be reduced by 6% to 8%. Disadvantages of chromate surface treatment The waste tank liquid of chromate treatment method contains a large amount of hexavalent chromium ions, and according to GB 8978--1996 Comprehensive Sewage Discharge Standard, the concentration of hexavalent chromium in the waste tank liquid is not more than 0.5mg/L. However, hexavalent chromium ions have carcinogenic effect on human body. Long-term exposure to hexavalent chromium compounds can lead to...

Plastic spraying process and its characteristics

2025-03-10

The process principle of plastic spraying Electrostatic powder coating technology through high-voltage electrostatic adsorption to achieve high efficiency coating. The core process is: compressed air will be powder coating conveyed to the electrostatic spray gun, the muzzle of the high-voltage generator produces 80-100kV static field triggered corona discharge, so that the atomized powder charged; charged particles in the electric field under the action of directional adsorption on the surface of the grounded workpiece, along with the thickening of the coating to form a charge buildup, the uniformity of the film through the homogeneous static repulsive autonomy control; and ultimately, the formation of dense film by the high-temperature curing to complete the whole process of industrialized application from powder adsorption to coating formation. The whole process from powder adsorption to coating molding is completed. Workflow Process Name Purpose of Process and Detailed Steps Related Equipment Related Materials 1. Pre-treatment Purpose: To remove the pollutants on the surface of the workpiece and form a phosphate layer that prevents rust and enhances adhesion Detailed Steps: ① Degreasing: Acid...

Sand blasting

2024-10-27

Sandblasting is a common surface treatment method used in the manufacture of aluminum alloy products and CNC machining production. In this article, I will detail the principles, application methods, advantages and disadvantages of the sandblasting process. What is sandblasting? Sandblasting is a surface treatment technology powered by compressed air to form a high-speed jet beam, the jet (such as sand, pearl salt, sodium bicarbonate, glycine powder, silver, etc.) high-speed jet to the surface of the workpiece or object to be treated. The beaded medium is guided to the surface of the material. The target surface is smooth, clean and shiny by friction reaction. Sandblasting is a traditional and time-consuming process for large and complex materials with different shapes. As a result, the concept of sandblasting was patented and introduced in the United States in 1870. The concept of sandblasting comes from the natural phenomenon of sand erosion caused by dust in desert areas. Sandblasting is used to...

Aluminum surface treatment process

2024-10-21

Aluminum surface treatment process can be divided into: Aluminum surface treatment process have those? I. Polishing Polishing is a common aluminum processing method, designed to reduce the roughness of the surface of the workpiece through mechanical, chemical or electrochemical action, so as to obtain a bright and flat surface. This processing method mainly utilizes polishing tools and abrasive particles or other polishing media to modify the surface of the workpiece. The main purpose of polishing is not to improve the dimensional or geometrical accuracy of the workpiece, but rather to focus on obtaining a smooth surface or mirror shine. In some cases, polishing is also used to eliminate luster, i.e., matting. A common tool used in the polishing process is the polishing wheel, which is usually made of multiple layers of canvas, felt or leather laminated together and clamped on both sides by a circular metal plate. The rim of the polishing wheel is coated with a polishing compound, which...