2016年2月25日星期四

Spiral steel pipe surface treatment


1, cleaning
   Application of solvent, emulsion cleaning steel surface to remove the oil, grease, dust, smooth agent and similar organic matter, but it can't remove the steel surface rust, oxide skin, flux etc., so it is  only as auxiliary trick.
  2, cleaning tools
   Mainly used the steel wire brush tool on the steel surface polished, can remove loose or tilt the oxide scale, rust, welding slag and other. Manual derusting tools can reach to the grade SA2 level and power tool cleaning can reach to the grade SA3, if steel appearance attached to the solid iron oxide scale, de-rusting tools result is not ideal, amounting to less than anticorrosion construction requirements of the anchor pattern depth.
  3, pickling
   Ordinary pickling treatment with chemical and electrolytic two ways, anti-corrosion pipeline using only chemical pickling, can remove the oxide scale, rust, coating, sometimes used as sand blasting to dispose of. Chemical cleaning is necessary to make the appearance of cleanliness and roughness, but its anchor light, and easy to form the pollution to the environment.
  4, spray (throw) shot de-rusting
   Spray (CAST) shoot de-rusting is after high power motor drive injection (left) blade speed to reverse shot, steel grit, steel shot, wire, minerals and other abrasive under the effect of centrifugal force on the pipe surface spray (throwing incident disposal, not only can eliminate rust, oxide and dirt and steel pipe under the effect of abrasive fierce impact and friction force, but also to achieve the demand of average coarse.
   Spray (CAST) shoot de-rusting, not only can be extended tube surface physical adsorption effect and strengthening anticorrosion layer and the pipe surface mechanical adhesion effect. Thus, spray (parabolic) injection is an ideal method for removing rust corrosion protection of pipeline. Generally speaking, blasting de-rusting primary for inside and outside of the pipe surface treatment, shot blasting (sand) de-rusting basically is used at pipe surface disposal.
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