Cold-drawn seamless steel pipe is also playing a great role in production, but the process of maintenance and maintenance of cold-drawn steel pipe is not smooth, because of this or that reason, the phenomenon of cold-drawn steel pipe rusting is more, for the consequence of cold-drawn steel pipe rusting can not be used, lost the original characteristics of cold-drawn steel pipe. 。 At this time, pickling will be carried out, so how do cold-drawn steel pipes do pickling and rust removal?
The solubility of cold-drawn steel pipe 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 anti-friction and lubrication performance. Zinc phosphating film 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. Phosphating treatment can be carried out at 40, 60 or 90 degrees C. Phosphating time is 4-10 minutes, sometimes even tens of minutes. The weight of phosphating film should be more than 3g/m2 in seconds.
Pickling of cold-drawn steel pipes should be carried out according to chemical principles, but pickling takes time and experience. Everyone can choose it appropriately according to their actual situation. In addition, when the cold-drawn steel pipes are rusty, don't rush to wash them with soap water and laundry detergent, so as to avoid all kinds of adverse effects.
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