Cold-drawn seamless steel pipe is also constantly playing a huge role in production, but the process of maintenance and maintenance of cold-drawn seamless steel pipe is not smooth, because of this or that reason, the phenomenon of cold-drawn seamless steel pipe rusting is more, for cold-drawn seamless steel pipe rusting. The result is that it can not be used and the original characteristics of cold-drawn seamless steel tube are lost. At this time, acid cleaning is needed. How do cold-drawn seamless steel tubes remove rust by acid cleaning?
The solubility of cold-drawn seamless steel tube and oxide in hydrochloric acid and sulfuric acid is different. Ferric trioxide can be dissolved 7.5 g in 10% hydrochloric acid solution and 0.98 g in 10% sulfuric acid solution at 20 C. At the same temperature and concentration, the solubility of hydrochloric acid to iron parts is more than 7 times higher than that of sulfuric acid. Therefore, hydrochloric acid is often used to remove rust on steel surface. Hydrochloric acid has the advantages of fast rust removal, high efficiency, no hydrogen embrittlement and good surface condition. It is safer and more economical than sulfuric acid in the preparation of lotion.
The method of pickling endangers the health of workers. Discharging waste liquor will cause industrial pollution. It needs to be treated by "three wastes". It is easy to produce oxide rust layer after pickling. If steel equipment is exposed to air for a long time, it will be corroded quickly. People are looking for a new technology to replace this method. In cold processing industry, such as takeover, wire drawing, extrusion and deep drawing, phosphating film is required to provide antifriction and lubricity performance. Zinc phosphating is generally used. First, zinc stearate layer with good lubricity is formed after saponification of zinc phosphating film. Second, zinc phosphating operation temperature is relatively low, and it can be phosphated at 40, 60 or 90 C. After treatment, the phosphating time is 4-10 minutes, sometimes even tens of seconds, and the weight of the phosphating film is more than 3g/m2.
The pickling of cold-drawn seamless steel pipe should be carried out according to chemical principle, but pickling takes time and experience. Everyone can choose it appropriately according to their own actual situation. In addition, when the cold-drawn seamless steel pipe rusts, don't rush to wash it with soap water and laundry liquid in order to avoid all kinds of disadvantage. Influence!
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