Introduction to the method of metal rust removal

Metal rust removal methods can be divided into four categories: 1: manual rust removal. 2: chemical rust removal. 3: mechanical rust removal. 4: ultrasonic rust removal.

1, manual rust removal: this is a more primitive method of rust removal. It is to use shovel knife, hammer, sand paper, steel wire brush and other rusting objects to achieve the purpose of rust removal. The effect of this rust removal method is slow, time-consuming, and operators are more prone to tiredness. It is not only time consuming, but also unable to achieve the desired effect. With the development of science and technology and the times, it is natural to be eliminated.

2, chemical rust removal as the name implies, chemical rust removal is through acid and metal chemical reaction, to achieve the effect of rust removal. It usually takes place in the workshop. Chemical rust removal is a kind of pickling treatment which uses acid to dissolve rust oxide. Mainly composed of hydrochloric acid, sulfur acid, nitric acid, phosphoric acid and other organic acids and hydrofluoric acid. Among the corrosion products, FeO is easy to dissolve, Fe304 is more difficult to dissolve, and Fe203 is the most difficult to dissolve. With the national attention to environmental protection, the government is more and more strict on the production process affecting the environment, and will be phased out in the future.

3. Mechanical rust removal: the most common mechanical rust removal is sand blasting and peening rust removal. Sand blasting rust removal is widely used in ship hull rust removal, large-scale steel structure rust removal and so on. Blast and rust generally used in the factory just out of the cast steel, to keep the surface of the product smooth and tidy. And there are many kinds of abrasives used in sand blasting, among which metal abrasive alloy steel pellets, stainless steel pellets and other products have long service life, low consumption, less dust, and good product cleaning and rust removal smoothness, so now the hull, Carbon steel, stainless steel, castings and other polishing rust removal and surface pretreatment are more and more widely used.

4, ultrasonic rust removal: is a physical method, mainly through high-frequency vibration to loosen the rust off. In the process of application, cleaning fluid should be used in order to achieve the purpose of rust removal, the surface roughness of the product is improved low, affected by the equipment and product fitness, and the scope is narrow.