The color-coated galvanized sheet has excellent colouring, corrosion resistance, decoration, and high strength and workability of steel sheet, so it is very popular with users. However, the application process sometimes occurs explosive paint situation,
color galvanized sheet explosive paint not only affects the beautiful decoration of the board surface, more importantly, the direct corrosion of paint film after exposure and the oxidation of non-oil passivated zinc layer on the substrate, will seriously
affect the anti-corrosion ability of the color plate, and reduce the service life of the color plate.
Preventing the occurrence of paint explosion problem of color coated galvanized sheet: In order to ensure that no quality accidents occur in the process of production and transportation of color coated products, and to minimize the impact of product pollution and product damage, the Clean Production Management System and the Clean Management Measures for Strip Steel Appearance were revised. Weekly process discipline inspection shall be carried out for on-site clean production of color painting units, and the inspection shall be notified.
Timely protection and timely updating of the curing furnace board thermometer, calibrating the thermometer coefficient with thermometer paper, finally confirming the temperature coefficient value of different color board, ensuring that the display temperature of the board thermometer and the temperature error of the calibrated board temperature of the temperature paper are (+4 C), in order to control and guide the production.
Strictly according to the requirement of the solidification temperature of passivation solution supplied by the manufacturer, it is confirmed that the temperature of 50-80 is the scale of temperature detection for chemical coated board. The temperature is measured by low temperature temperature temperature measuring paper in rolls, and the color roll sample with quality problems is tested by water-boiling aging marking.
In order to ensure that the thickness of passivation film can be controlled, the passivation quality of galvanized sheet can be guaranteed, the adhesion between the coating film and the base plate can be improved, and the quality accident of explosive paint of color sheet products caused by passivation of color coatings can be prevented. The requirements for re-inspection of passivation film of color coatings and roll changing process of passivation coatings are refined. Communicate on time every month, control the target practice value of key coatings and passivator materials which affect the mechanical properties of color plate products, in order to ensure the quality of color coating products.