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Factors affecting seamless steel pipe coating are mainly the following four aspects: the passivation film of seamless steel pipe is thermodynamically inhibited sub-stable structure, and its maintenance role is related to the media in the environment. But seamless tubes, regardless of the environment in which they are used, need to be cleaned regularly to remove harmful substances adhering to the surface.

Chloride ions are extremely harmful to the coating of seamless steel tubes. In the process of stopping the surface passivation, seamless tubes must strictly control the amount of chloride ions in the passivation solution. Many of the chemical materials used for passivation have limited chloride ion requirements. There are also strict water quality requirements for chloride ions in the configuration of the passivation solution and clean water to ensure that no chloride ions are present in the passivation waste.

Seamless Steel Tube Factory, Seamless Steel Tube Manufacturer tells you that low nickel content in seamless pipe steel tube has low passivation performance, so the martensite content and chromium, nickel content has a great influence on the passivation performance of rectangular tube. The more lubrication on the surface of the seamless pipe steel tube, the lower the roughness, the greater the difficulty of foreign matter attachment, corrosion will be reduced to a low point. In addition, cleaning after passivation should be carefully stopped so that the residual acid can promote anodic response, maintain film integrity and ensure enhanced corrosion resistance.

During production and transportation, oil stains will inevitably adhere to the surface of the seamless steel pipe, which will affect the quality of the descaling and phosphating, and reduce the bond between the coating and the substrate. Organic solvents are mainly used to dissolve saponified and unsaponified oils to remove oil stains. Commonly used organic solvents are ethanol, cleaning gasoline, toluene, and trichloroethylene. More effective solvents are trichloroethylene, which do not burn and can be used for degreasing at high temperatures.