Electrogalvanized and chromate-free chemical conversion treated steel plate with excellent white rust resistant performance
A chromate-free and chromate-free technology, applied in the plating of superimposed layers, devices for applying liquid to the surface, coatings, etc., can solve problems such as rust and white rust, and improve white rust resistance. Effect
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Embodiment 1
[0117] In this example, the influence of the amount of Ni contained in the range of 0.04 μm in the depth direction of the plating layer from the interface between the plating layer and the chromate-free film on the white rust resistance was investigated. In Example 1, an experiment was performed by producing an organic chromate-free film based on a polyolefin resin.
[0118] (1) Manufacture of electroplated Zn steel plate
[0119] As a plated original plate, an Al-killed cold-rolled steel plate produced by a conventional method was used. After degreasing and pickling, electroplating was performed using a plating solution having the following composition in a circulation type plating apparatus with a plating area of 180 mm×300 mm to obtain an electroplated Zn steel sheet.
[0120] (bath composition)
[0121] The plating solution obtained by adding Ni in the form of sulfate in the range shown in Table 1 while containing the following components was used.
[0122] ZnSO 4 ·7...
Embodiment 2
[0161] In the present example, except that a chromate-free chemical conversion-treated electroplated Zn steel sheet having a chromate-free film different from that of Example 1 was used, the Ni of the outermost layer was investigated in the same manner as in Example 1. The effect of the amount on the white rust resistance. Specifically, in this example, based on the method described in Example 1 of Japanese Patent Laid-Open No. 2006-43913, an organic chromate-free film (resin film) was produced, and the temperature of the plating solution was changed. experiment.
[0162] (1) Preparation of resin water-based liquid
[0163] Here, a resin film is produced from an aqueous solution of a carboxyl group-containing polyurethane resin, an aqueous dispersion of an ethylene-unsaturated carboxylic acid copolymer, silica particles, and an aqueous resin solution containing a wax. The specific production method is as follows.
[0164] (1-1) Preparation of carboxyl-containing polyurethan...
Embodiment 3
[0181] In the present example, except that a chromate-free chemical conversion-treated electroplated Zn steel sheet having a chromate-free film different from that of Example 1 was used, the Ni of the outermost layer was investigated in the same manner as in Example 1. The effect of the amount on the white rust resistance. Specifically, in this example, a phosphate film was produced by the method shown below, and experiments were performed by changing the temperature of the plating solution.
[0182] As the phosphate treatment liquid, an impregnated zinc phosphate treatment liquid "PB-3312" manufactured by Nippon Pacificing Co., Ltd. was used. The free acidity (FA) of the said treatment liquid was 2.4 points, and the total acidity (TA) was 16.9 points. Here, FA and TA have the following meanings.
[0183] (a) FA: Titration solution required to change the color of the treatment solution from yellow to blue-yellow when titrating 10 mL of the phosphate treatment solution using ...
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Abstract
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