Trivalent chrome complex for hot dip aluminum-zinc plate and preparation method of trivalent chrome complex

A technology of hot-dip aluminum-zinc plate and trivalent chromium, which is applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance and cannot meet the corrosion resistance requirements of aluminum-zinc plate, and achieves good corrosion resistance and environmental protection. requirements, overcoming unstable effects

Active Publication Date: 2015-11-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

This patent is a passivation treatment method for a hot-dip galvanized sheet, but since the surface of the aluminum-zinc sheet also contains a large amount of aluminum (about 55%), after the use of the aluminum-zinc sheet, the corrosion resistance is very poor (NSST / 72h already more than 5%), which cannot meet the user's corrosion resistance requirements for aluminum-zinc panels

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  • Trivalent chrome complex for hot dip aluminum-zinc plate and preparation method of trivalent chrome complex

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Embodiment 1

[0034] Prepare trivalent chromium complexes for hot-dip galvanized zinc sheets according to the raw materials numbered 1-9 groups of trivalent chromium complexes in the following table 1. The preparation method is roughly as follows: first add hexavalent chromium to water, dissolve and stir Add reducing agent after uniformity, add acidic substance after it is completely dissolved, and react for 1 to 6 hours under constant stirring.

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Abstract

The invention relates to a preparation method of a trivalent chrome complex, in particular to a passivation processing solution for an environment-friendly hot dip aluminum-zinc plate and a passivation processing solution with excellent corrosion resistance. The trivalent chrome complex for the hot dip aluminum-zinc plate is prepared from water, hexavalent chromium, reducing agents and acidic materials according to the molar ratios of 100:0.2-1.5:0.1-4.5:0.2-7.5. The trivalent chrome complex for the hot dip aluminum-zinc plate has excellent corrosion resistance. Corrosion resistance of a solidified coating reaches the passivation level of hexavalent chromium, the requirement for environmental friendliness can be met, harmful elements like hexavalent chromium are not contained, and the trivalent chrome complex does not harm the environment or human bodies.

Description

Technical field [0001] The invention relates to a preparation method of a trivalent chromium complex, in particular to an environmentally friendly hot-dip aluminum-zinc plate passivation treatment solution, in particular to a passivation treatment solution with excellent corrosion resistance. Background technique [0002] The composition of the hot-dip aluminum-zinc plate coating combines the physical protection of Al, high durability and the electrochemical protection of Zn. It has formability, heat resistance and high reflectivity. The surface is highly decorative and bright silver-gray and regular Patterns and embossed feeling, mainly used in construction industry and electrical cabinets. At present, however, aluminum alloys are prone to damage in the form of pitting corrosion, crevice corrosion, stress corrosion and corrosion fatigue when used in humid, industrial gas, fuel gas, salt and dust atmospheres. The surface treatment of aluminum alloy is the key to expand its appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/46C23C22/34C23C22/53
Inventor 董学强郭太雄冉长荣岳安宏徐权常军张爱萍
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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