Shenzhen Leibang Technology Co., Ltd. specializes in the research and development of metal surface treatment technology. After more than ten years of development, it has begun to take shape and become a large-scale metal surface treatment agent production and sales company. Our main products are wire phosphating, cold phosphating, coating phosphating, anti-rust phosphating, black phosphating, chromium-free environmentally friendly aluminum film and various metal surface treatments. Metal workpieces are surface-adjusted before phosphating. Can have the following aspects:
1. Overcome the roughening effect
Surface adjustment can overcome the roughening effect after strong acid and alkali treatment. In general, a strongly alkaline solution generally has an effect of thickening the crystal of the phosphate film. After the metal workpiece is degreased with a strong alkali, due to the poor water washability of some alkalis, such as sodium hydroxide, sodium silicate, etc., the active nucleus on the surface of the metal is often covered with a layer of hydroxide or oxide film, resulting in a metal surface. The number of crystal nuclei and the free energy of the reaction are lowered, so that the phosphate film is rough and porous, and the film formation is not complete. Therefore, after the metal workpiece is degreased by the strong alkaline degreaser, the surface should be adjusted. After the metal workpiece is pickled and rusted, the metal will produce a rough surface due to acid corrosion. Although the effective surface area of ​​the metal is increased, this may be partly due to the increase in the weight of the phosphating film after pickling, but also The active point of the metal surface is reduced, and thus a rough phosphating film is also produced. After the metal workpiece is surface-adjusted, the surface activity and inactive points of the metal workpiece can be homogenized, and the corrosion defects caused by strong alkali degreasing or strong acid derusting of the metal workpiece can be eliminated, thereby overcoming the treatment caused by strong acid and alkali treatment. The roughening effect.
2. Speed ​​up phosphating
The surface adjustment accelerates the phosphating reaction rate, lowers the phosphating temperature, and increases the active point of the metal surface due to the surface adjustment, providing a nucleus for the growth of the phosphating film so that the metal surface is in contact with the phosphating solution. Immediately, the film is started, which greatly accelerates the initial film formation speed of the phosphate film, thereby shortening the phosphating time. According to the relevant information, the surface adjustment of the workpiece can shorten the phosphating time by about 1/2. In addition, the surface adjustment can also reduce the phosphating temperature, reduce energy consumption, and improve the phosphating environment in winter. It is indispensable for low temperature and room temperature phosphating. condition.
3. Refine phosphating film grains
The surface adjustment refines the phosphating film grains and improves the appearance of the phosphating film. After the surface of the metal workpiece is adjusted, the crystal nucleus formed by the contact between the active point of the metal surface and the phosphating agent is extremely fine. According to relevant information, The crystal size of the phosphating film is reduced from 40um to 20um, which prevents the formation of large crystal nuclei and prevents the formation of iron phosphate blue film. The resulting phosphating film is finely crystallized, improves the appearance of the phosphating film, and enhances phosphating. The bonding strength of the film to the metal surface improves the corrosion resistance of the phosphating film.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
1. Overcome the roughening effect
Surface adjustment can overcome the roughening effect after strong acid and alkali treatment. In general, a strongly alkaline solution generally has an effect of thickening the crystal of the phosphate film. After the metal workpiece is degreased with a strong alkali, due to the poor water washability of some alkalis, such as sodium hydroxide, sodium silicate, etc., the active nucleus on the surface of the metal is often covered with a layer of hydroxide or oxide film, resulting in a metal surface. The number of crystal nuclei and the free energy of the reaction are lowered, so that the phosphate film is rough and porous, and the film formation is not complete. Therefore, after the metal workpiece is degreased by the strong alkaline degreaser, the surface should be adjusted. After the metal workpiece is pickled and rusted, the metal will produce a rough surface due to acid corrosion. Although the effective surface area of ​​the metal is increased, this may be partly due to the increase in the weight of the phosphating film after pickling, but also The active point of the metal surface is reduced, and thus a rough phosphating film is also produced. After the metal workpiece is surface-adjusted, the surface activity and inactive points of the metal workpiece can be homogenized, and the corrosion defects caused by strong alkali degreasing or strong acid derusting of the metal workpiece can be eliminated, thereby overcoming the treatment caused by strong acid and alkali treatment. The roughening effect.
2. Speed ​​up phosphating
The surface adjustment accelerates the phosphating reaction rate, lowers the phosphating temperature, and increases the active point of the metal surface due to the surface adjustment, providing a nucleus for the growth of the phosphating film so that the metal surface is in contact with the phosphating solution. Immediately, the film is started, which greatly accelerates the initial film formation speed of the phosphate film, thereby shortening the phosphating time. According to the relevant information, the surface adjustment of the workpiece can shorten the phosphating time by about 1/2. In addition, the surface adjustment can also reduce the phosphating temperature, reduce energy consumption, and improve the phosphating environment in winter. It is indispensable for low temperature and room temperature phosphating. condition.
3. Refine phosphating film grains
The surface adjustment refines the phosphating film grains and improves the appearance of the phosphating film. After the surface of the metal workpiece is adjusted, the crystal nucleus formed by the contact between the active point of the metal surface and the phosphating agent is extremely fine. According to relevant information, The crystal size of the phosphating film is reduced from 40um to 20um, which prevents the formation of large crystal nuclei and prevents the formation of iron phosphate blue film. The resulting phosphating film is finely crystallized, improves the appearance of the phosphating film, and enhances phosphating. The bonding strength of the film to the metal surface improves the corrosion resistance of the phosphating film.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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