Treating solution for forming black hexavalent chromium-free chemical coating on zinc or zinc alloy plated substrate, and method for forming black hexavalent chromium-free chemical coating on zinc or
A technology for treating solution and zinc alloy, applied in the field of treating solution of black conversion film, can solve the problems such as the inability to guarantee the corrosion resistance of the finished film and the difficulty in forming a dense film, etc.
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Embodiment 1～6
[0060] The steel plate was galvanized with NZ-98 solution supplied by Dipsol Chemical Co., Ltd. to form a galvanized layer with a thickness of 8 μm, which was immersed in a treatment solution containing trivalent chromium. The composition of the solution is shown in Table 1 below.
[0061] Example number
[0062] In Table 1, the Cr 3+ Source is CrCl 3 (in Examples 1, 2, 3 and 5), CrPO 4 (in Examples 4 and 6) and Cr(NO 3 ) 3 (in Example 5). NO 3 - The concentration of Cr(NO 3 ) 3 (in Example 5) or by adding HNO 3 (in Examples 1, 2 and 3) or NaNO 3 (in Examples 4 and 6) adjustments were made. Again, the SO 4 2- source is Na 2 SO 4 , while the PO 4 3- Source is NaH 2 PO 4 . The balance of each treatment solution was water. The metal salts used, such as Co and Ni, were their sulfates (in Examples 1, 4 and 6) and chlorides (in Examples 2, 3 and 5). The source of Si used was colloidal silica and the source of Ti used was titanium trichloride. The conc...
Embodiment 7～10
[0064] The steel plate is plated with basic zinc-nickel alloy (Ni%: 5-15%) or zinc-iron alloy (Fe%: 0.3-2.0%), with a thickness of 8 μm, and then soaked in a treatment solution containing trivalent chromium. The composition is shown in Table 2 below.
[0065] Example number
7
8
9
10
Cr 3+ (g / L)
4.5
4.5
4.5
4.5
NO 3 · (g / L)
0.6
0.4
0.2
0.4
NO 3 · / Cr 3+ The molar ratio of
0.11 / 1
0.07 / 1
0.04 / 1
0.07 / 1
PO 4 3· (g / L)
12
12
12
15
SO 4 2· (g / L)
10
0
15
2
Cl · (g / L)
0
10
0
0
Oxalic acid (g / L)
15
7
15
15
Malonic acid(g / L)
0
7
0
0
Succinic acid (g / L)
10
0
0
0
Adipic acid(g / L)
0
0
0
20
Chelating agent / Cr 3+ The molar rati...
Embodiment 11-14
[0069] After the trivalent chromizing treatment in Examples 1, 8 and 9, the steel panels were subjected to an overcoat treatment. The conditions of the overcoat treatment used here are summarized in Table 3 below.
[0070] Example number
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