1.Hot galvanized pollutants emit less.
2.The contaminants of hot-dip galvanizing are mainly waste acid from pickling workpieces.
3.The pollutants of cold galvanizing mainly include waste acid from pickling workpieces, electroplating waste liquid, waste passivation liquid, etc.
4.The types and quantity of pollutants discharged by cold galvanizing greatly exceed that of hot galvanizing.
5.Hot dip zinc standard: GB / T13912-92
6.Hot-dip galvanizing: Hot-dip galvanizing is generally carried out after the edging process is completed. When the load flat steel thickness is not less than 5mm, the average zinc layer weight after galvanizing is not less than 610 grams / square meter; when the load flat steel thickness is less than 5mm At the time, the average zinc layer weight after galvanizing is not less than 460 g / m2, and the quality and requirements after galvanizing should comply with GB / T13912.