Surface treatment liquid for zinc-based coated steel sheet, zinc-based coated steel sheet with surface-treated film, and method for producing the same

A surface treatment liquid and surface treatment technology, applied in the field of zinc-based plated steel sheets, can solve problems such as unresearched, insufficient, and damaged appearance of sweat resistance, solvent resistance, and heat cracking resistance, and achieve storage stability Excellent, excellent coating adhesion effect

Active Publication Date: 2021-02-19
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a fluorine-containing compound or an organophosphorus oxy compound is contained, the yellowing of the film tends to become conspicuous when heated at a high temperature exceeding 500° C., thereby impairing the appearance.
Furthermore, no studies have been conducted on perspiration resistance, solvent resistance, thermal crack resistance, etc., and these are insufficient

Method used

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  • Surface treatment liquid for zinc-based coated steel sheet, zinc-based coated steel sheet with surface-treated film, and method for producing the same
  • Surface treatment liquid for zinc-based coated steel sheet, zinc-based coated steel sheet with surface-treated film, and method for producing the same
  • Surface treatment liquid for zinc-based coated steel sheet, zinc-based coated steel sheet with surface-treated film, and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120](1) Test board

[0121]The various zinc-based coated steel sheets shown below were used as test plates. In addition, the zinc-based plating layer is formed on both sides of the steel sheet, and the adhesion amount in Table 1 refers to the adhesion amount of the zinc-based plating layer per one side. In addition, the surface area ratio of the Zn—Al—Mg ternary eutectic obtained by the following method is also shown in Table 1. That is, the untreated part of the surface of the plating layer was observed by SEM at an observation magnification of 100 times. Next, Mg mapping is performed through EDS in the same field of view. The analysis result is subjected to image analysis to convert white and black into two gradations. The area ratio of the Zn—Al—Mg system ternary eutectic is calculated from the two-tone gradation image. The same evaluation was performed in any 8 fields of view, and finally the area ratios of all fields of view were arithmetic averaged, and the obtained average val...

Embodiment 2

[0280]The preparation of (1) test plate, (2) pretreatment (cleaning), and (3) surface treatment liquid was performed in the same manner as in Example 1 above.

[0281](4) Treatment method

[0282]Use a bar coater to apply the surface treatment liquid of No. 93 in Table 2 to the pre-treated test plate shown in the "Steel Plate" column of Table 4, and then put it directly into the oven without washing with water. Single side formation with adhesion amount (in each single side) 900mg / m2The surface treatment film. At this time, set the temperature of the test plate and the temperature of the surface treatment liquid when the surface treatment liquid is applied to TSAnd TL, Will TS-TLIt is shown in Table 4 as ΔT. In addition, regarding the drying of the applied surface treatment liquid, Table 4 shows the pre-drying time t (seconds) until the test plate is placed in the oven and the highest value in the subsequent heat drying in the oven Plate temperature PMT. It should be noted that the adhesi...

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Abstract

The present invention provides a surface treatment solution for producing a zinc-based plated steel sheet with a surface treatment film that does not contain a chromium compound in the surface treatment film and is resistant to discoloration by heat. , heat cracking resistance, corrosion resistance of the flat part, corrosion resistance after alkali degreasing, blackening resistance, stacking blackening resistance, water seepage resistance, solvent resistance, sweat resistance, coating adhesion and storage stability. excellent. The surface treatment liquid for zinc-based plated steel sheets of the present invention is characterized in that a silane coupling agent (A) having a glycidyl group, a tetraalkoxysilane (B), a zirconium carbonate compound (C), a glass transition Anionic polyurethane resin (D), vanadium compound (E), molybdic acid compound (F) and water at temperature (Tg) of 80°C to 130°C have pH of 8.0 to 10.0 and the addition amount of each component satisfies a predetermined relationship.

Description

Technical field[0001]The present invention relates to a surface treatment solution for a zinc-based coated steel sheet, a method for manufacturing a zinc-based coated steel sheet with a surface-treated coating film, and a zinc-based coated steel sheet with a surface-treated coating film.Background technique[0002]In the past, in order to improve the corrosion resistance (white rust resistance, red rust resistance), the surface of the zinc-based plated steel sheet was applied with a treatment liquid mainly composed of chromic acid, dichromic acid or its salts. Chromated steel plate. However, due to recent global environmental issues, it is increasingly desired to use pollution-free surface-treated steel sheets that are not chromated, so-called chromium-free treated steel sheets.[0003]Such a zinc-based plated steel sheet with a surface treatment film (hereinafter, also referred to as "surface treatment steel sheet") is used in automobiles, home appliances, OA equipment, building compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/60C23C26/00C23C28/00
CPCC23C28/00C23C2222/20C23C22/78C23C2/06C23C2/26C23C28/3225C23C2/40C23C22/62C23C22/60C23C30/00C23C22/82C23C26/00
Inventor 远藤玲央那冈井和久梶山浩志河野崇史
Owner JFE STEEL CORP
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