rust

Defect Name: rust < br / > definition and appearance: < br / > rust is irregular spot, block and strip-shaped rust spots on the surface of strip steel. The light rust is light yellow, the more serious is yellowish brown or red, and the serious can be black. The surface is rough. It can appear in any part of strip steel with different shapes and areas.  & nbsp;< Br / > causes: < br / > ● too much moisture in antirust oil or poor antirust ability< Br / > ● uneven or too little oil is applied to the steel strip< Br / > ● poor packaging, Steel strip and surrounding medium (air, water, etc.) especially contact with corrosive media, resulting in chemical reaction. < br / > ● steel coils are stored in the intermediate warehouse for a long time, especially in the environment with large temperature difference and humid air. < br / > hazards: < br / > affect the surface quality and coating effect of steel strip. < br / > prevention and elimination methods: < br / > ● ensure the quality of antirust oil. < br / > ● apply antirust oil according to regulations to ensure uniform coating< Br / > ● ensure good product packaging, prevent water from entering the steel belt during transportation and storage, and avoid contact with corrosive media< Br / > ● reasonably organize the production to prevent the steel coil from staying in the intermediate warehouse for too long< Br / > check and judge < br / > ● judge with naked eyes< Br / > ● slight spot rust and slight edge rust are allowed (subject to no erosion on the plate surface); < br / >