: Rust grades for the construction process of the alloy tube used epoxy, vinyl, phenolic anti-corrosion coatings, general requirements are the surface of the alloy tube reached nearly white level, drawn through practice proved to be all mill scale, rust and other dirt can get rid of this rust grades almost sufficient to meet the requirements adhesion of the coating and alloy pipe, jet descaling process can be used at a lower cost can be stabilized reliable quality to nearly white level conditions. Second: If you want to make the rust effect to achieve the desired results, according to the hardness of the surface of the alloy tube, the original extent of corrosion, the required surface roughness, coating type to select the abrasive, single-layer epoxy, two or three layer polyethylene coating, in order to achieve the desired rust effect, requires the use of a mixture of grit and steel shot abrasive. Role of etching the surface of the steel, steel grit, steel shot hardened steel surface. Third: you want to get the distribution of preferably uniform cleanliness and roughness, the abrasive particle size and the ratio of the design is very important, because the roughness is too easily cause thinning of the coating at the peak of the anchor pattern , at the same time will be too deep because the anchor pattern, it is easy in the process of corrosion of the formation of bubbles, a serious impact on the performance of the anti-corrosion layer. (In the actual operation, the ideal ratio of abrasive grit and steel shot is difficult to achieve): prior to the ejection process to remove grease and fouling of the surface of the alloy tube, the heating furnace can also be used on the tube the body is preheated to 40-60 degrees Celsius, so that the surface of the alloy tube to maintain the dry state, because the surface of the alloy tube is without grease and other dirt, this can enhance the effect of the rust Further, the drying of the surface of the alloy tube is conducive to the steel pills, grit and rust and mill scale separation, which would clean the surface of the alloy tube before rust.