Improved hot galvanizing method of iron handicraft or furniture

Abstract

The invention relates to an improved hot galvanizing method of an iron handicraft or furniture. The method comprises the following steps: (1) uncoiling and degreasing a workpiece; (2) removing dust; (3) washing; (4) assisting plating; (5) baking; (6) galvanizing by dipping; (7) settling; (8) passivating; (9) cooling. In the method, a degreasant is changed into acidity and is composed of a sulfuric acid solution, OP-10 and di-o-tolyl-thiourea. Thus, a washing procedure can be saved; a water resource and the degreasant can be saved; the workpiece does not generate an over-cleaning phenomenon; a pickling solution is composed of a hydrochloric acid solution, phosphoric acid, alkylphenol ethoxylates, lauryl sodium sulfate and ethylenediamine tetraacetic acid, so that the pickling speed is improved, formation of acid mist and use of a complexing agent can be restricted, reduction of cadmia in galvanizing zinc is facilitated, the malleability of a zinc coating on the surface of the work-piece is improved, proper temperature and event are adopted in the subsequent galvanizing by dipping, and the thickness and the stability of the zinc coating at the surface of the workpiece are ensured. Thus, the improved hot galvanizing method is a method which is simple and convenient for operation and good in galvanized effect.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanizing of metal products, in particular to an improved hot-dip galvanizing method for iron handicrafts or furniture. Background technique [0002] Zinc is easily soluble in acid and alkali. It is an amphoteric metal. It hardly changes in dry air. In humid air, a dense basic zinc carbonate film will be formed on its surface, so zinc is often Used as a coating to protect other metals. After the surface of the common steel substrate is galvanized, the dense zinc layer protects the steel substrate. When the zinc layer is damaged, the zinc acts as the anode and the steel substrate acts as the cathode, so the zinc corrodes first and protects the steel substrate. [0003] The more commonly used galvanizing methods in the past are electro-galvanizing and hot-dip galvanizing. The electro-galvanizing method uses electrolysis to form a uniform, dense, and well-bonded technology or alloy deposition laye...

AI Technical Summary

Problems solved by technology

Among them, the hot-dip galvanizing method includes the steps of oil removal and degreasing, water washing, rust removal, water washing, fluxing, drying, hot-dip galvanizing, cooling, passivation, and water washing. , sodium carbonate, and sodium silicate mixed aqueous solution are used to degrease the workpiece at a high temperature above 90 degrees Celsius. During the work, the odor is strong, and the surface of the workpiece will appear iron leakage or roughness; rust removal uses a single sulfuric acid or hydrochloric acid, which is easy to Over-corrosion or hydrogen evolution occurs on the surface of the workpiece; the amount of zinc slag and zinc ash in the hot-dip galvanizing process is relatively large, which directly leads to an increase in the cost of hot-dip galvanizing