Aqueous fusion agent used for flux method hot dip coating low aluminium zinc alloy and its application method

Abstract

An aqueous flux for hot dip coating of low-Al Zn alloy by flux method is prepared from zinc chloride (70-80 mass%), ammonium chloride (8-10 mass%) and cerium chloride (4-10 mass%). Said hot dip coating process includes such steps as removing oil and rust from the iron or steel workpiece, immersing it in said aqueous flux for a certain time, baking at 120-160 deg.c, and immersing in molten Zn-Al alloy.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized aluminum for iron and steel products, and in particular provides a flux method for hot-dip galvanizing of low-aluminum-zinc alloys by solvent method, which is suitable for hot-dip galvanized aluminum for steel products by flux method (dry method) 5%) is a water flux used in the plating flux treatment process in the alloy process. Background technique [0002] The flux method (dry method) hot-dip galvanized aluminum (or rare earth zinc-aluminum) alloy process is to immerse the steel products after degreasing and derusting in a flux (usually an aqueous solution) for an appropriate time, and then take them out and dry them. A layer of solid flux film is formed on the surface, and then immersed in the molten zinc-aluminum alloy plating solution for hot-dip plating. Relevant with the present invention, close technology has: [0003] [1] Blickwede D.J. 55% Al-Zn Alloy Coated Sheet Steel, ir...

AI Technical Summary

Problems solved by technology

[0013] A large amount of gas and low-boiling volatile substances are produced, which weakens the effect of the flux, and easily leads to defects such as partial missing plating, bulges and sticky slag of steel products, and it also causes serious environmental pollution.