Zinc-based cladding steel plate

Abstract

A zinc-based coating steel plate includes a base plate layer, an oxide layer which is adjoined to the base plate layer, and a zinc-based coating which is adjoined to the oxide layer, the oxide layer including a grain boundary silicon oxide and/or an intracrystalline silicon oxide therein, a thickness of the oxide layer being 3 μm to 10 μm, and a mass fraction of the grain boundary silicon oxide in the oxide layer being greater than or equal to 4%.

What is claimed is: 
     
         1 . A zinc-based coating steel plate, comprising at least a base plate layer, an oxide layer adjoined to the base plate layer, and a zinc-based coating adjoined to the oxide layer, the oxide layer comprising a grain boundary silicon oxide and/or an intracrystalline silicon oxide therein, a thickness of the oxide layer ranging from 3 μm to 10 μm, a mass fraction of the grain boundary silicon oxide in the oxide layer being greater than or equal to 4%. 
     
     
         2 . The zinc-based coating steel plate of  claim 1 , wherein the mass fraction of the grain boundary silicon oxide in the oxide layer ranging from 5.0% to 6.4%. 
     
     
         3 . The zinc-based coating steel plate of  claim 1 , wherein a mass fraction of the intracrystalline silicon oxide in the oxide layer is greater than or equal to 1%, and a ratio of the mass fraction of the intracrystalline silicon oxide in the oxide layer to the mass fraction of the grain boundary silicon oxide in the oxide layer is less than 1:2. 
     
     
         4 . The zinc-based coating steel plate of  claim 3 , wherein the mass fraction of the intracrystalline silicon oxide in the oxide layer ranging from 1.0% to 2.0%. 
     
     
         5 . The zinc-based coating steel plate of  claim 1 , further comprising an inhibition layer adjoined between the oxide layer and the zinc-based coating, a thickness of the inhibition layer being less than or equal to 2 μm. 
     
     
         6 . The zinc-based coating steel plate of  claim 5 , wherein the inhibition layer comprises at least iron and zinc therein. 
     
     
         7 . The zinc-based coating steel plate according to  claim 5 , wherein the inhibition layer further comprises aluminum therein. 
     
     
         8 . The zinc-based coating steel plate of  claim 1 , wherein the zinc-based coating comprises a pure zinc coating and/or a zinc alloy coating, the zinc alloy coating comprising zinc, the zinc alloy coating further comprising at least one of iron, aluminum, magnesium and nickel; and
 contents of iron, aluminum, magnesium, nickel and zinc in the zinc alloy coating are as follows in mass fractions:   a content of iron is 0.0˜15.0%;   a content of aluminum is 0.0˜60.0%;   a content of magnesium is 0.0˜4.0%;   a content of nickel is 0.0˜20.0%; and   the rest is zinc.   
     
     
         9 . The zinc-based coating steel plate of  claim 8 , wherein the base plate layer comprises iron, carbon, manganese and silicon, and further comprises at least one of aluminum, chromium, molybdenum, niobium, titanium and boron; and
 contents of iron, carbon, manganese, silicon, aluminum, chromium, molybdenum, niobium, titanium and boron in the base plate layer are as follows in mass fractions:   a content of carbon is 0.05%˜1.00%;   a content of manganese is 1.20%˜3.00%;   a content of silicon is 0.10%˜3.00%;   a content of aluminum is 0.00˜1.00%;   a content of chromium is 0.00˜0.60%;   a content of molybdenum is 0.00˜0.60%;   a content of niobium is 0.00˜0.10%;   a content of titanium is 0.00˜0.10%;   a content of boron is 0.0000˜0.0025%; and   the rest are iron and unavoidable impurities.   
     
     
         10 . The zinc-based coating steel plate of  claim 9 , wherein a microstructure of the base plate layer comprises a retained austenite.