Self-repairing chromium-free passivation treatment fluid used for galvanized steel coil
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A chromium-free passivation and self-healing technology, applied in the direction of metal material coating process, etc., can solve the problems that the film layer does not have self-healing ability and low corrosion resistance, so as to solve the problem of chromium pollution, low processing temperature, prevent Intrusion effect
Inactive Publication Date: 2012-12-26
ANHUI WEILAI SURFACE TECH
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However, due to the lack of self-healing ability of the film layer, the corrosion resistance is relatively low, and the salt spray test only passed 72h
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Embodiment 1
[0034] A self-repairing chrome-free passivation treatment solution for galvanized coil steel, comprising the following components (by weight):
[0035] Polyacrylic acid 5.0%, LaCl 3 3.5%, γ-glycidyl etheroxypropyl trimethoxysilane 0.5%, ZnO sol 0.2%, NaMoO 4 0.5%, PEG-1000 2.0%, the balance is water.
[0036] The optimum pretreatment temperature of the treatment solution is 35°C at room temperature, and the optimum treatment temperature after passivation is 50°C.
Embodiment 2
[0038] A self-repairing chromium-free passivation treatment solution for galvanized coil steel, comprising the following components (by mass percentage):
[0039] Acrylic modified polyurethane 4.5%, CeCl 3 2.0%, γ-glycidyl etheroxypropyl trimethoxysilane 0.5%, ZnO sol 0.5%, NaMoO 4 1.5%, PEG-1000 5.0%, and the balance is water.
[0040] The optimum pretreatment temperature of the treatment liquid is 25°C at room temperature, and the optimum treatment temperature after passivation is 100°C.
Embodiment 3
[0042] A self-repairing chromium-free passivation treatment solution for galvanized coil steel, comprising the following components (by mass percentage):
[0043] Fluorine modified polyurethane 8.0%, La(NO 3 ) 3 0.1%, γ-glycidyl etheroxypropyl trimethoxysilane 0.4%, ZnO sol 0.4%, NaMoO 4 0.4%, PEG-1000 0.3%, and the balance is water.
[0044] The optimum pretreatment temperature of the treatment solution is 35°C at room temperature, and the optimum treatment temperature after passivation is 80°C.
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Abstract
The invention relates to a self-repairing chromium-free passivation treatment fluid used for galvanized steel coil. The passivation treatment fluid comprises the following components of, by weight, 1-10% of a functional resin, 0.01-5% of a rare earth compound, 0.01-5% of a silane coupling agent, 0.01-5% of inorganic sol, 0.01-5% of a corrosion inhibitor, 0.01-5% of a dispersing agent, and the balance being water. The passivation treatment fluid provided by the invention can form a compact chromium-free passivation film having self-repairing capacity on the surface of the galvanized steel coil, so that corrosion resistance and adhesive force of a metal substrate are increased effectively; and the performance is superior to that of a conventional chromizing liquid passivation film. The passivation treatment fluid is low in cost and simple in process, and has small pollution to pollution, relatively high economic benefit and social benefit.
Description
technical field [0001] The invention belongs to the technical field of chromium-free passivation of galvanized sheets, and in particular relates to a self-repairing chromium-free passivation treatment solution for galvanized steel coils. Background technique [0002] Cr(VI) passivation is a common pretreatment technology for galvanized coil steel. The passivated plate is made into a color-coated plate after coating. It has the advantages of light weight, beautiful appearance, and excellent corrosion resistance. It is widely used in construction , home appliances and auto parts and other fields. However, due to the strong toxicity and carcinogenic effect of Cr(VI) itself, the discharge of passivation waste liquid containing Cr(VI) is subject to stricter control, which greatly limits its application. To solve such problems, the development and adoption of environmentally friendly chromium-free passivation technology has attracted more and more attention. However, at present,...
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