Method for steel product batch hot dip galvanizing

Abstract

The invention discloses a method applicable to rolled-steel lot-quantity hot dipping zinc, namely, performing lot-quantity hot dipping zinc to rolled steels in a zinc alloy plating bath formulated by two kinds of binary intermediate alloy. The zinc alloy plating bath comprises the following components: manganese of 0.3%-0.5%, cerium of 0.005%-0.03% and zincium of the rest, and the two kinds of binary intermediate alloy comprise a zincium-manganese binary intermediate alloy comprising manganese of 2%-3% and zincium of the rest; a zincium-cerium binary intermediate alloy comprising cerium of 2%-3% and zincium of the rest.The invention has advantages of simple alloy coating technique, easy controlling of components of alloy zincium bath; effective control of super-thick growth of the coatinglayer of silicon-contained reactive steel, improvement of corrosion resistance capability of the coating layer, great delaying of the generation of white rust, elimination of disorder inhomogenous color on the coating layer surface of zincium-manganese alloy for obtaining more bright and smooth coating layers; reduced production cost by because of adopting cheap alloy elements; simple technique without changing original hot dipping zinc equipment, which is propitious to scale-production of lot quantity hot dipping zinc of rolled steels.

Description

A method suitable for batch hot-dip galvanizing of steel technical field The invention belongs to the technical field of steel hot-dip galvanized alloy. More specifically, the present invention relates to a method suitable for batch hot-dip galvanizing of steel materials. Background technique Because of its high strength, good ductility and many other advantages, steel is the most productive and widely used metal material in the world, but its disadvantage is that it is easy to corrode. Hot-dip galvanizing is one of the most traditional and reliable metal protection methods. At present, most of the steels used for hot-dip galvanizing are killed steels and semi-killed steels (called active steels) with high silicon content. The presence of silicon in steel will affect the growth of each phase layer in the coating, causing the coating to appear gray, super thick and poor in adhesion, which greatly reduces the appearance quality and performance of the coating. In recent ye...

AI Technical Summary

Problems solved by technology

Among them, zinc-aluminum alloy can obtain a bright coating on the surface, but it cannot inhibit the ultra-thick coating growth of silicon-containing active steel, and zinc-nickel alloy can inhibit the ultra-thick coating growth of silicon-containing active steel, but due to the higher price of nickel, the Production cost of zinc-nickel master alloy

Adding low-cost manganese to the zinc bath can also effectively inhibit the super-thick coating growth of silicon-containing active steel, but although the obtained zinc-manganese alloy coating has better corrosion resistance and appropriate thickness, the oxide film on the coating surface It is thicker, the color is messy and uneven, and the color is gray, which affects the appearance of the coating

Therefore, the promotion and application of zinc-manganese alloy coatings is limited

Images