Preparation of galvanized angle steel before galvanizing
1. Check whether the workpiece has holes, ears, etc. for hanging during processing. If there is no hanging point, it needs to be opened or welded. The specific opening and making position and size can be communicated with the customer first to understand the process performance requirements of the angle steel sent by the customer to avoid damage to its performance.
2. Check whether the angle steel has the process holes for exhaust and reflux zinc liquid required for zinc immersion. Otherwise, it is necessary to determine the opening and making position and size, which also requires communication with the customer.
3. According to the degree of rust on the surface of the angle steel, whether the surface covering can be removed by pickling, whether there are pollutants such as paint and engine oil, and according to its properties and characteristics, decide to use fire burning, mechanical grinding, alkali washing and other removal methods.
4. Alkali washing and degreasing. Alkali washing and degreasing belong to the pre-treatment category of hot-dip galvanizing of galvanized angle steel in Guangxi. The main process content is to eliminate grease, paint, etc. on the surface of the angle steel, especially pay attention to the removal of paint.
5. Pickling belongs to the pre-treatment category of hot-dip galvanizing. The main process is to remove rust, iron oxide, deposited salt and other surface coverings.
6. Inspection and treatment after pickling. The main process is to check the defects of angle steel pickling and whether the surface quality of pickled angle steel is ideal, and take targeted measures. If the pickling is not sufficient, it is necessary to pickle again or extend the pickling time; if the pre-pickling treatment is not thorough, pickle again after re-treatment.
