Derusting method of steel structure

1, blast: the use of high-speed operation of machinery and equipment to a certain size of steel by centrifugal force throws out a method of shot and component was thrown out of the violent collision attack so as to achieve the purpose of removing surface corrosion of steel. It uses the steel varieties are: Iron and steel cut wire pill two, iron pills is formed in the spray particle size and rapid cooling conditions using melted iron in 2 ~ 3mm iron pills, the surface is very round. It's cheaper but less durable. In the shot blasting process, the iron balls are smashed and dust is removed as a result of repeated impact. The steel wire cutting pill is formed by cutting the steel wire of the waste steel wire rope into small sections of 2mm, the surface of which is provided with sharp corners, the rust removal effect is relatively high, and the utility model is not easy to be broken, and the service life is prolonged, but the price is improved. The shot blasting surface of the latter is a little rougher.

2, shot peening: the use of high-pressure air with steel shot injection to the surface of the component to achieve a rust removal method.

3, sand blasting derusting: use of high-pressure air with quartz sand sprayed to the surface of the component to achieve a rust removal method. The source of quartz sand: sand, sand and artificial sand etc.. Sand has low cost and wide range of sources, but it has great pollution to the environment. The rust removal relies entirely on manual operation. The surface roughness of the components after derusting is small, and it is difficult to meet the requirements of the friction coefficient. The sand before use should remove the salt.

The above two derusting methods require less than 85% humidity of the environment.

4, acid cleaning: rust cleaning, also known as chemical rust, the principle is to use the acid in the acid lotion and metal oxide chemical reaction, so that the metal oxide dissolved, and remove the surface of the steel corrosion and dirt. But pickling can not achieve the effect of surface roughness by shot blasting or shot blasting. And we must wash and passivation in pickling; lots of waste water, the waste acid and acid fog caused by environmental pollution. If improper handling will cause the metal surface erosion, the formation of pits. Few are currently in use.

5, hand and power derusting: simple tools, easy construction. But the intensity of labor is great and the quality of derusting is poor. The law can only be used locally when other methods are not available. For example, the individual parts of the dressing or installation, site local rust treatment. The tools used are: grinding machine, blade, wire brush, cloth etc..

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