Pretreatment technique for steel member hot spraying

Abstract

The invention discloses a pretreatment technique for the heat spraying for a steel part, belonging to the technique field of surface treatment. The process is as follows: surface cleaning-degreasing-derustin-sealing-surface coarsening-heat spraying. The invention has the advantages that the technique has simple requirements to the treatment of the parts, the distribution of the technique, and is easy to operate, good pretreatment quality, which warrants the quality of the heat spraying; besides, the technique requires little investment to the infrastructure, and has high treatment efficiency, low construction cost, and good economic benefit.

Description

technical field [0001] The invention relates to a pretreatment technology for thermal spraying of iron and steel components, and belongs to the technical field of metal surface treatment. In particular, it relates to a pretreatment process for thermal spraying of steel components. Background technique [0002] Due to long-term exposure to the atmosphere, the steel components for outdoor use are exposed to climate change, sun and rain, and the surface is rapidly oxidized to form a layer of ferric oxide, which seriously affects the strength and service life of the steel structure. In order to prevent oxidation on the surface of steel components, most steel structures are protected by hot-spraying zinc, hot-spraying aluminum and other processes on the surface of the steel structure. The anti-corrosion period can reach more than 30 years without maintenance. [0003] The treatment before thermal spraying of iron and steel metal generally adopts the following process: surface cl...

AI Technical Summary

Problems solved by technology

[0003] The treatment before thermal spraying of iron and steel metal generally adopts the following process: surface cleaning → shot blasting (or sandblasting) → thermal spraying, the process is simple and clear, and easy to operate. , its surface roughness can meet the requirements of Sa2.5, but because the steel shot recycled during shot blasting adheres to the oil stain on the component, resulting in many fine oil particles attached to the surface of the cleaned workpiece, which affects the steel component. Anti-corrosion has buried hidden dangers. In addition, some grooves, grooves, gaps or internal parts of components are difficult to be effectively cleaned. Therefore, some metal components that require long-term use (such as buried pipelines) use high-temperature burning components to remove oil and rust. , and then shot blasting to thoroughly clean the oil and oxides on the surface of the component, and finally thermal spraying method to improve the pre-treatment effect of the metal surface and ensure the anti-corrosion ability of the coating, but this significantly increases the construction cost of the treatment; high Sandblasting surface quality treatment required by the standard also has similar problems

[0004] If the steel components are degreased and derusted by chemical methods and then thermally sprayed, the oil and rust on the surface and inside the components can be effectively removed, and the cost is also low. However, due to the poor surface roughness of the steel components, the thermally sprayed metal Poor layer adhesion, difficult to achieve anti-corrosion purpose