Coated steel sheet with excellent corrosion resistance and alkali resistance
A technology of coated steel plate and steel plate, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problems of metal material corrosion and inability to provide long-term use of evaporators, etc., and achieve excellent alkali resistance, Excellent water (wet) resistance
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Embodiment 1
[0074] 1. Fabrication of coated steel plate
[0075] As the original coating board, the thickness of the board is 0.5mm, and the coating weight on one side is 40g / m 2 Fused Al-9Si coated steel sheet. On the surface of the coating original plate, the chemical conversion treatment solution (embodiment: No.1-1~No.1-7, comparative example: No.1-8~No. 1-10) Make it reach the specified amount of adhesion, make it dry for 10 seconds at a plate temperature of 100° C., and make the chemical conversion treatment steel sheets shown in Table 2 (Example: No.2-1~No.2-11, Comparative Example: No.2-12~No.2-15). The molar ratios of fluorides, oxides, and hydroxides on the surface of each chemical conversion-treated steel sheet were measured by X-ray photoelectron spectroscopy (XPS; ESCA). Specifically, after separating the peak waveforms of Ti and Zr into X-F, X-O, and X-OH (X: Ti, Zr), each component was quantified to determine the ratio. The amount of fluoride measured here corresponds t...
Embodiment 2
[0112] Example 2 shows that the corrosion resistance of the processed part of the coated steel sheet can also be improved by annealing the plated layer of the coated steel sheet.
[0113] 1. Fabrication of coated steel plate
[0114] As coating original plates, the following two types of molten Al-9Si coated steel plates were prepared. The original coating sheet A and the original coating sheet B differ only in whether or not an annealing treatment is performed after the plating layer is formed.
[0115] [Coated raw board A]
[0116] ·Molten Al-9Si coated steel plate (thickness 0.5mm, coating weight on one side 40g / m 2 )
[0117] ·No annealing treatment after forming the coating
[0118] [Coating original plate B]
[0119] ·Molten Al-9Si coated steel plate (thickness 0.5mm, coating weight on one side 40g / m 2 )
[0120] ·Annealing treatment (heating at 420°C for 30 hours) after forming the coating
[0121] Coated steel sheets (Examples: Nos. 7-1 to 7-2) were produced un...
Embodiment 3
[0131] Example 3 shows that the heat reflection properties of the coated steel sheet can also be improved by adding a near-infrared reflective pigment to the surface coating film.
[0132] 1. Fabrication of coated steel plate
[0133] As the original coating board, the thickness of the board is 0.5mm, and the coating weight on one side is 40g / m 2 Fused Al-9Si coated steel sheet.
[0134] Replace the surface coating of No.4-1 shown in Table 4, use the surface coating of No.8-1 or No.8-2 shown in Table 8, except this point, in the No.5 of embodiment 1 Coated steel sheets of -3 were produced under the same conditions (Examples: Nos. 9-1 to 9-2). The top coat of No. 4-1 differs from the top coats of Nos. 8-1 to 8-2 in whether or not a black pigment is incorporated. In addition, the top coat of No. 8-1 and the top coat of No. 8-2 differ in whether or not the black pigment to be blended is a near-infrared reflective (heat reflective) black pigment.
[0135] [Table 8]
[0136] ...
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