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Production process and control of galvanized iron wire


1, before plating to eliminate the stress Where the maximum tensile strength greater than 1034Mpa key, important parts before plating should be 200 ± 10 ℃ to eliminate stress more than 1 hour, carburizing or surface hardening should be at 140 ± 10 ℃ to eliminate stress 5 hours the above.
2, cleaning the cleaning agent used should not affect the adhesion of the coating, the substrate without corrosion.
3, acid activated acid activating solution should be able to remove parts of the surface of the corrosion products, oxide film (skin), the substrate without corrosion.
4, galvanized galvanized zinc can be used galvanized or zinc chloride and other processes, should use the appropriate additives to meet the requirements of the coating required by the standard.
5, after the light plating should be light treatment.
6, passivation of hydrogen in addition to the parts should be in addition to hydrogen and then passivation, passivation before application of 1% H2SO4 or 1% hydrochloric acid activation 5 ~ 15s. Unless otherwise specified in the design drawings, passivation should be treated with chromic acid.