Composition for chemical conversion treatment of Zn-Al-Mg alloy-plated steel sheet, and Zn-Al-Mg alloy-plated steel sheet
A chemical conversion treatment, zn-al-mg technology, applied in the direction of superimposed layer plating, hot-dip plating process, metal material coating process, etc., can solve the problems of not easy cooling, complicated equipment, not easy to use, etc. To achieve the effect of preventing blackening phenomenon
Pending Publication Date: 2022-07-29
POHANG IRON & STEEL CO LTD +2
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Problems solved by technology
In particular, the chromate treatment solution is a strong acidic aqueous solution with a pH in the range of 1 to 1.5. As far as chromate products for building materials are concerned, the thickness of the steel plate is more than 1.0mm, and it is not easy to cool due to latent heat after drying, so There is a problem that the drying temperature cannot be raised sufficiently
Therefore, in order to solve the above-mentioned problem, proposed a kind of technology (ISIJ, 1990, p383-390 that Co (III) salt is carried out spray treatment in the cooling process of the Mg coating of Zn-4.0% Al-0.1% ), and in recent years proposed a technology that the surface of Zn-Al-Mg alloy plated steel sheet is treated with an aqueous solution of Mg, Al, Zn salt and then treated with an aqueous solution of zinc chloride (Korean Patent 10-1638307 ), but there is a problem that the equipment is complex and not easy to use
Method used
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Embodiment
[0052] Hereinafter, the Example of this invention is demonstrated in detail. The following examples are only for understanding the present invention and do not limit the present invention.
[0053] 1. Example
[0054] (1) Preparation of composition for chemical conversion treatment
[0055] Dissolve ammonium phosphate (made from isononyl phosphate and bis(N-aminoethyl)methylamine) and zinc phosphate hydrate (Duksan Chemical Co.) in 1 L of pure water, and add lithium silicate compound and phosphoric acid , thereby preparing a composition for chemical conversion treatment with a pH of 3.5. Each composition of the chemical conversion treatment composition is shown in Table 1 below.
[0056] (2) Manufacture of chemical conversion treated steel sheets
[0057] The chemical conversion treatment composition prepared above was coated with a coating amount of 50 g / m 2 And the Zn-xAl-yMg plated steel sheet having the x value and the y value in Table 1 below was then dried in a hot-...
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The purpose of the present invention is to provide a chemical conversion treatment composition and a chemical conversion treatment method for preventing the occurrence of surface blackening defects in a Zn-Al-Mg alloy-plated steel sheet and a chromate-treated steel sheet. According to the present invention, provided is a composition for chemical conversion treatment of a Zn-Al-Mg alloy-plated steel sheet, the composition comprising, based on the total weight of the composition for chemical conversion treatment: 0.2-20 wt% of an ammonium phosphate salt derived from an alkyl phosphate ester and an alkylamine; 0.1 to 10 wt% of zinc phosphate; 0.1 to 10% by weight of a silicate compound; and the balance of water.
Description
technical field [0001] The invention relates to a composition for chemical conversion treatment of a Zn-Al-Mg alloy plated steel sheet and a Zn-Al-Mg alloy plated steel sheet. Background technique [0002] Generally, in order to prevent or reduce corrosion of metals, zinc and zinc-based alloy plating is performed. However, as the use amount of zinc in nature increases, the price of zinc metal increases, and the depletion of zinc becomes a problem. As a countermeasure for this, a method of reducing the amount of plating by performing plating excellent in corrosion resistance by adding alloy elements is being studied. As a part of this, many alloy platings in which aluminum and magnesium are added to zinc have been developed, and are mainly used in construction, but in recent years, there is a trend to expand the use to home appliances and automobiles. In particular, in order to protect the surface of the Zn-Al-Mg alloy plated steel sheet and to easily achieve corrosion resi...
Claims
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IPC IPC(8): C23C22/08C23C28/00C23C2/06
CPCC23C2/06C23C22/08C23C28/00C23C28/34C23C28/321
Inventor 赵斗焕银熙材朴䡰宽韩银洙
Owner POHANG IRON & STEEL CO LTD