Passivator and passivation for hot galvanized sheet

A technology of hot-dip galvanized steel sheet and passivating agent, which is applied in the coating process of metal materials, can solve the problems of high cost of passivating agent and unsatisfactory passivating effect, and achieve simple formula, good passivating effect, and raw material Easy to get effect

Active Publication Date: 2012-10-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing chromium-free passivators either use molybdate as the main component or rare earth metal salts as the main component, but the cost of these passivators is relatively high, and the passivation effect is not ideal, and they cannot full

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0020] First, degrease the surface of the hot-dip galvanized steel sheet that has not undergone any passivation treatment but is protected by oiling after off-line, rinse it with tap water, rinse it with distilled water or deionized water, dry it with hot air and wait for passivation .

[0021] Based on the technical solution of the present invention, this example describes 13 groups of passivating agents of the present invention (the total amount of passivating agents can be 1 L), and the formulations of each group of passivating agents are shown in Table 1 below.

[0022] Table 1: List of formulation ingredients of various examples

[0023] Example number Phytic acid g / L Phosphoric acid g / L nano-SiO 2 g / L Water-soluble acrylic resin g / L Titanium acetylacetonate g / L Vanadium acetylacetonate g / L Isopropanolg / L 1 60 0 50 40 10 20 50 2 40 0 50 40 10 20 50 3 80 0 50 40 10 20 50 4 60 0 30 40 10 20 50 5 60 0 ...

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PUM

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Abstract

The invention discloses a passivator for hot galvanized sheet. The passivator comprises water and components with the following concentrations: 230g / L-90g / L of nano SiO, 30g / L-60g / L of water-soluble acrylic resin, 40g / L-80g / L of phytic acid and / or phosphoric acid, 3g / L-12g / L of titanium acetylacetonate, 10g / L-30g / L of vanadyl acetylacetonate and 50g / L-100g/ L of isopropanol. A hot galvanized sheet passivation method by using the passivator provided by the present invention is as below: passivator is coated on the hot galvanized sheet on a production line by means of spraying, blade coating or roll coating, with a drying plate at a temperature of 80-100 DEG C. The passivator provided by the invention has advantages of simple formula, easily available raw materials and convenient usage; besides, the passivator shows good passivation effect, and is healthy and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of steel plates, and in particular relates to a passivating agent and a passivating method for steel plates. Background technique [0002] Hot-dip galvanizing is the most commonly used protective cathodic protection method for cold-rolled steel sheets, but the galvanized layer is easily corroded in the air (especially in humid air). In order to prevent the corrosion of the galvanized layer, passivation treatment is required. The traditional passivation method is to coat the surface of the hot-dip galvanized steel sheet with a hexavalent chromium passivation agent, and form a passivation layer containing hexavalent chromium salt after drying. , but hexavalent chromium is toxic and carcinogenic, which not only affects human health, but also easily causes harm to the environment, and it will be gradually eliminated by the market. The ROHS directive issued by the European Union clearly rest...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23C22/73
Inventor 周新贵张长瑞曹英斌刘荣军王思青余金山邹世钦殷刘彦王洪磊赵爽罗征杨备杨会永
Owner NAT UNIV OF DEFENSE TECH
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