Will Q235NH weathering steel be corroded?

Q235NH weathering steel can be used in many harsh environments, but corrosion may occur. Therefore, the rust on the surface of q235nh weathering steel plate should be treated in time to prolong its service life.

1. Cleaning
Washing steel surfaces with solvents and emulsions can remove oil, grease, dust, lubricants and similar organic compounds, but can not remove rust, oxide scale and flux from the surface of steel. Therefore, it is only an auxiliary means of anticorrosion production.

2. Tool derusting
The steel surface can be polished by wire brush to remove loose or warped oxide scale, rust and welding slag. The derusting effect of hand tools can reach SA2, and that of electric tools can reach SA3. If there is firm oxide scale on the steel surface, the derusting effect of the tool is not ideal, and the anchoring line depth required by anti-corrosion construction cannot be achieved.

3. Pickling
Chemical pickling and electrolytic pickling are generally used. Chemical pickling is only used for pipeline anti-corrosion, which can remove scale, rust and old coating, and sometimes can be used as re-treatment after sand blasting. Although chemical cleaning can make the surface clean and rough to a certain extent, its anchor line is shallow and easy to pollute the environment.

4. Spray (throw) to remove rust
Spraying (polishing) derusting is to make steel sand, steel shot, iron wire segment, mineral and other abrasives spray (polishing) to the surface of q235nh weathering steel plate under the action of centrifugal force by high-power motor driving the spraying (polishing) blade to rotate at high speed. It can not only thoroughly remove rust, oxide and dirt, but also achieve uniform roughness required by steel pipe under the action of severe impact and friction of abrasives.