Views:4 Author:Site Editor Publish Time: 2018-03-15 Origin:Site
Steel pipes will rust if they are exposed for a long time. If they are buried for a long time, the surface will also be oxidized, if not cleaned. Then it will affect the normal function. In particular, 40Cr seamless steel tubes, which are generally used in important fields of industry, such as machine running pipes used in factories, used as machines for oil delivery, and also used as sewage systems. As we all know, sewage discharge in factories is directly related to the normal operation of factories. 40Cr seamless steel pipe for sewage discharge is easily eroded and may rust, so if it is not cleaned, normal operation will be affected.
With the continuous development of China's economy and the country's vigorous development of the energy industry, seamless steel pipe is an important way of energy protection. In the process of anticorrosion of oil and gas pipeline, the surface treatment of steel pipe is one of the key factors to determine the service life of pipeline anticorrosion. It is the prerequisite for the strong combination of corrosion protection layer and steel pipe. It is verified by the research organization that the life span of the anticorrosion layer depends not only on the type of coating, the coating quality and the construction environment, but also the effect of the surface treatment of the steel pipe on the life of the anticorrosion layer is about 50%. Therefore, it should be strictly based on the requirements of the anticorrosion layer on the surface of the steel tube, and continue to explore and sum up, and improve the surface treatment method of the steel pipe continuously.
Cleaning the surface of steel by solvent and emulsion to remove oil, grease, dust, lubricant and similar organic matter, but it can not remove rust, oxide skin and flux of steel surface, so it is only an auxiliary means in the anticorrosion production.
It mainly uses steel brush and other tools to polish the steel surface, which can remove loose or tilted oxide scale, rust and slag. Manual tool rust removal can reach Sa2 level, power tool rust removal can reach Sa3 level, if the steel surface adhered firmly to the oxide iron, the tool rust removal effect is not ideal, can not reach the anticorrosion construction requirements of the anchor depth.
In general, two methods of chemical and electrolysis are used to do acid cleaning. Only chemical acid washing is used in pipeline anticorrosion, which can remove oxide skin, rust and old coating. Sometimes it can be used as the reprocessing after sand blasting. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor grain is shallow, and it is easy to pollute the environment.
Spray (throwing) ejection removing rust is the high speed rotation of spray (throwing) blade through high power motor, which makes steel sand, steel ball, wire section, mineral and other abrasives spray (throwing) treatment on the surface of steel tube under the action of centrifugal force. It can not only completely remove rust, oxide and dirt, but also achieve the required uniform roughness under the effect of abrasive impact and friction force of the steel tube. After spraying, the rust can not only expand the physical adsorption of the pipe surface, but also enhance the mechanical adhesion of the coating to the pipe surface. Therefore, spraying (throwing) rust removal is an ideal way to remove rust.