Electrophoretic galvanized iron product and surface treatment method thereof

• Main Authors: QI ENLIANG, QI XINHAO, WANG CHANGWEI, YANG WEIYU, LYU LEI, FENG LIMING, ZHUANG QIANHAO, ZHANG WEIDONG
• Format: Patent
• Language: Chinese; English
• Published: 09.08.2022
• Subjects: APPARATUS THEREFOR; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention discloses an electrophoresis galvanized iron product and a surface treatment method thereof, the surface of the galvanized iron product is provided with an electrophoresis resin film layer formed by electrophoresis, and a layer of chemical conversion film is further arranged between the surface of the galvanized iron product and the electrophoresis resin film layer; the chemical conversion film is formed after the galvanized iron product is subjected to oil removal chemical conversion; the chemical conversion coating contains zinc oxalate, zinc fluoride and zinc oxide. According to the surface pretreatment method for the electrophoresis galvanized iron product, an oil removal chemical conversion one-step method is firstly adopted, so that oil stains and natural oxidation films on the surface of the galvanized iron product can be removed, a layer of chemical conversion protection film of zinc oxalate, zinc oxide and zinc fluoride is formed on the surface of the product, and the corrosion resistan