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Solution composition containing trivalent chrome for surface treatment of steel sheet, galvanized steel sheet surface-treated with same, and method for manufacturing galvanized steel sheet

A hot-dip galvanized steel sheet and surface treatment technology, applied in hot-dip plating process, superimposed layer plating, coating, etc., can solve the problems of reduced weldability, reduced anti-corrosion effect, reduced film fuel resistance, etc. Achieve the effect of excellent weldability and excellent alkali resistance

Active Publication Date: 2020-08-28
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition contains a porous silica component, so there is a problem of severe discoloration in a humid atmosphere, and the porous silica has a strong hygroscopic property, so there is a problem of triggering on the alloyed galvanized steel sheet. The problem of rapid discoloration
[0007] In addition, the present inventors have confirmed that in the case of forming a thin film on a steel plate for fuel tanks, when the thin film contains organic components such as urethane resin, the reduction in the anti-corrosion effect due to condensed water inside the fuel still occurs. The problem
In addition, in the manufacture of fuel tanks, excellent weldability is required in consideration of the manufacture of containers by welding, but organic components as described above cause a problem that significantly reduces weldability
Furthermore, it was confirmed that the above-mentioned resin components were dissolved in the fuel during the long-term contact with the fuel, thereby reducing the fuel resistance of the film.

Method used

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  • Solution composition containing trivalent chrome for surface treatment of steel sheet, galvanized steel sheet surface-treated with same, and method for manufacturing galvanized steel sheet
  • Solution composition containing trivalent chrome for surface treatment of steel sheet, galvanized steel sheet surface-treated with same, and method for manufacturing galvanized steel sheet
  • Solution composition containing trivalent chrome for surface treatment of steel sheet, galvanized steel sheet surface-treated with same, and method for manufacturing galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Changes in physical properties depending on the content of trivalent chromium compounds

[0076] A surface treatment solution composition containing trivalent chromium is prepared as follows: comprising a trivalent chromium compound, a vanadium-based rust and corrosion inhibitor, a cobalt-based rust and corrosion inhibitor, a silane coupling agent and water, wherein the trivalent chromium compound It is prepared by adding chromium phosphate and chromium nitrate in distilled water and reacting at 80°C for 1 hour and then cooling to normal temperature. Cobalt (III) nitrate, the silane coupling agent is a mixture of tetraethyl orthosilicate and 3-glycidoxypropyl trimethoxysilane in a weight ratio of 1:1, and is recorded in the following table 2 The content (based on the solid content of the composition) is mixed to prepare a surface treatment solution composition containing trivalent chromium.

[0077] In addition, in the following examples, the case where the surface tre...

Embodiment 2

[0106] Changes in physical properties depending on the ratio of chromium(III) phosphate and chromium(III) nitrate

[0107] Use the trivalent chromium surface treatment solution composition of Invention Example 3, but the ratio of chromium phosphate (III) and chromium nitrate (III) is controlled to the ratio of chromium phosphate and chromium nitrate recorded in the following table 3, except that In addition, a hot-dip galvanized steel sheet test piece formed with a trivalent chromate inorganic thin film was produced in the same manner as in Example 1.

[0108] About the manufactured test piece, flat plate corrosion resistance and blackening resistance were evaluated by the same method as Example 1, and the evaluation result is described in Table 3.

[0109] [table 3]

[0110]

[0111] *Component content is based on 14% solids.

[0112] As shown in the above-mentioned Table 3, as the proportion of chromium phosphate increases, the effect of improving the corrosion resistan...

Embodiment 3

[0114] Changes in physical properties depending on the content and type of silane compound

[0115] In addition to using chromium nitrate and chromium phosphate as a trivalent chromium compound, vanadium acetylacetonate as a vanadium-based rust and corrosion inhibitor, cobalt (III) nitrate as a cobalt-based rust and corrosion inhibitor, and 1 as a silane coupling agent In addition to mixing the silane compound of tetraethyl orthosilicate and 3-glycidoxypropyl trimethoxysilane in the ratio of 1 (based on the solid content of the composition) in the following table 4, A hot-dip galvanized steel sheet test piece formed with a trivalent chromate inorganic thin film was produced by the same method as in Example 1.

[0116] For the flat plate corrosion resistance, processed portion corrosion resistance and blackening resistance of the manufactured test piece, it was evaluated by the same method as in Example 1, and the alkali resistance, fuel resistance and fingerprint resistance we...

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Abstract

The present invention provides a solution composition for surface treatment, an alloying galvanized steel sheet surface-treated with the same, and a method for manufacturing the alloying galvanized steel sheet, the solution composition containing: 10-30 wt% of a trivalent chrome compound comprising chromium phosphate (A) and chromium nitrate (B), of which the content ratio A / (A+B) satisfies 0.3-0.6; 5-50 wt% of a silane compound; 0.2-3 wt% of a vanadium-based anti-rust and corrosion agent; 0.5-5 wt% of a cobalt-based anti-rust and corrosion agent; and 12-84.3 wt% of water. The alloying galvanized steel sheet comprising an inorganic coating layer containing trivalent chromium has excellent effects on corrosion resistance, blackening resistance, weldability, fuel resistance, and alkali resistance.

Description

technical field [0001] The invention relates to a surface treatment solution composition containing a trivalent chromium compound, an alloyed galvanized steel sheet for surface treatment using the composition and a manufacturing method thereof. Background technique [0002] The hot-dip coating material forming the alloyed zinc (Zn) layer exhibits excellent corrosion resistance due to the protective effect brought by the sacrificial corrosion protection of the base iron, and compared with the pure zinc coating, it passes the zinc-iron The alloy phase has excellent welding characteristics, so it is widely used as a material for vehicle parts such as fuel tanks for motorcycles and automobiles. [0003] However, the exposed surface of the alloyed hot-dip galvanized material is formed by the alloy phase of zinc and zinc-iron, so when exposed to a general corrosive environment, especially a humid atmosphere, it is easy to produce zinc oxide on the surface. White rust of oxides, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08C09D5/08C23C2/26C23C2/06C23C2/40C23C28/00
CPCC23C2/06C23C2/26C23C2/40C23C28/00C23C22/42C23C2222/10C23C2222/20C23C2/28C23C28/30C23C28/3225C23C28/34C23C28/345C09D5/084C23C2/29C23C22/08C23C28/321C23C2/265C23C22/47C23C22/73C23C22/82
Inventor 曺秀铉孙元镐
Owner 浦项股份有限公司
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