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简体中文With the rapid development of the domestic energy industry, the application of stainless steel pipes is also rapidly increasing. Among them, the surface treatment of stainless steel pipes is one of the key factors that determine the anti-corrosion service life of the pipeline during the anti-corrosion construction process of oil and gas pipelines. An important prerequisite for a firm combination. According to authoritative certification, the service life of the anti-corrosion layer depends on the type of coating, coating quality and construction environment. The surface treatment of stainless steel pipes accounts for about half of the impact on the service life. Therefore, it is necessary to strictly follow the anti-corrosion coating specifications for stainless steel The surface requirements of the pipe continuously optimize the surface treatment process of the stainless steel pipe.
At present, the common surface treatment methods of stainless steel pipes mainly include cleaning, rust removal, pickling, etc. These methods are introduced below.
Cleaning
Using solvents and emulsions to clean the surface of stainless steel materials can remove oil, grease, dust, lubricants and similar organic matter. However, this method cannot remove the rust, oxide scale, welding flux, etc. on the surface of stainless steel materials, so it is only a part of anti-corrosion production. Kind of auxiliary means.
Tools for rust removal
Tools such as wire brushes are generally used to polish the surface of stainless steel, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the surface of stainless steel is adhered with solid oxide scale, the tool rust removal effect is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
Pickling
Usually there are two methods for pickling treatment: chemical and electrolysis. Stainless steel pipeline anticorrosion only uses chemical pickling, which can remove oxide scale, rust, and old coating. Sometimes this method can be used as a reprocessing after sandblasting and rust removal. . Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and easily pollute the environment.
Spray (throwing) shooting
Spraying (projecting) rust removal is to drive the spraying (projecting) blades to rotate at a high speed through a high-power motor, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed (projected) on the steel pipe surface under the action of centrifugal force , Not only can completely remove rust, oxides and dirt, but also the stainless steel tube can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.
After spraying (throwing) to remove the rust, not only can the physical adsorption on the surface of the stainless steel pipe be expanded, but also the mechanical adhesion between the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray (throwing) rust removal is an ideal way to remove rust from pipelines. Generally speaking, shot blasting (sand) rust removal is mainly used for pipe inner surface treatment, and shot blasting (sand) rust removal is mainly used for pipe outer surface treatment. Several problems should be paid attention to when using spray (throwing) to remove rust.
Cleaning
Using solvents and emulsions to clean the surface of stainless steel materials can remove oil, grease, dust, lubricants and similar organic matter. However, this method cannot remove the rust, oxide scale, welding flux, etc. on the surface of stainless steel materials, so it is only a part of anti-corrosion production. Kind of auxiliary means.
Tools for rust removal
Tools such as wire brushes are generally used to polish the surface of stainless steel, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the surface of stainless steel is adhered with solid oxide scale, the tool rust removal effect is not ideal, and the anchor pattern depth required for anti-corrosion construction cannot be achieved.
Pickling
Usually there are two methods for pickling treatment: chemical and electrolysis. Stainless steel pipeline anticorrosion only uses chemical pickling, which can remove oxide scale, rust, and old coating. Sometimes this method can be used as a reprocessing after sandblasting and rust removal. . Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and easily pollute the environment.
Spray (throwing) shooting
Spraying (projecting) rust removal is to drive the spraying (projecting) blades to rotate at a high speed through a high-power motor, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed (projected) on the steel pipe surface under the action of centrifugal force , Not only can completely remove rust, oxides and dirt, but also the stainless steel tube can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive.
After spraying (throwing) to remove the rust, not only can the physical adsorption on the surface of the stainless steel pipe be expanded, but also the mechanical adhesion between the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray (throwing) rust removal is an ideal way to remove rust from pipelines. Generally speaking, shot blasting (sand) rust removal is mainly used for pipe inner surface treatment, and shot blasting (sand) rust removal is mainly used for pipe outer surface treatment. Several problems should be paid attention to when using spray (throwing) to remove rust.
