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Production process of multiple aluminum zinc alloy hot-dipped on surface of carbon steel

A production process, hot-dip plating technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems of endangering human health and environment, high toxicity of hexavalent chromium, complicated treatment process, etc., to achieve Excellent corrosion resistance, prevention of isolation from corrosion environment and galvanized layer, excellent effect of corrosion resistance

Inactive Publication Date: 2012-07-11
周然华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hexavalent chromium is very toxic and seriously endangers human health and the environment, so its use is strictly restricted
At present, the chromium-free passivation processes reported at home and abroad mainly include molybdate and rare earth metal salt passivation, silicate passivation, vanadate passivation, titanium salt passivation, organic passivation and tungstate passivation, etc. , but the corrosion resistance of these chromium-free conversion coatings still has a certain gap compared with chromate conversion coatings. Although the corrosion resistance of some composite conversion coatings is close to or exceeds that of chromate conversion coatings, the treatment process is more complicated and the cost is too high. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The production process of hot-dip plating multi-component aluminum-zinc alloy on the surface of No. 45 steel includes pickling step, fluxing step, drying step, hot-dip step and passivation step, wherein the pickling solution used in the pickling step It is 0.3wt% hydrogen fluoride, 1.5wt% hydrogen chloride, 0.3wt% nitric acid, 0.5wt% urotropine and the water of the remainder; the pickling temperature is 25°C, and the pickling time is 18min; The additive used in the plating step is: 8wt% NH 4 Cl, 3wt% ZnCl 2 , 3wt% MnCl 2 , 3wt% NaF and the rest of the water, the helper plating temperature is 68°C, and the helper plating time is 100 seconds; in the drying step, hot air drying is adopted, the temperature is controlled at 100°C, and the time is 10 minutes; The hot-dipping solution adopted in the hot-dip step is: 6wt% aluminum, 1.2wt% nickel, 1.2wt% silicon, 0.5wt% magnesium, 0.9wt% manganese, 1.2wt% titanium and the zinc of the balance; The temperature of the hot-dip ba...

Embodiment 2

[0014] The production process of hot-dip plating multi-element aluminum-zinc alloy on the surface of Q235 steel includes pickling step, fluxing step, drying step, hot-dip step and passivation step, wherein the pickling solution adopted in the pickling step is 0.3wt% of hydrogen fluoride, 1.5wt% of hydrogen chloride, 0.3wt% of nitric acid, 0.5wt% of urotropine and the rest of the water; pickling temperature is 25 ℃, pickling time is 18min; The auxiliary agent that step adopts is: the NH of 8wt% 4 Cl, 3wt% ZnCl 2 , 3wt% MnCl 2 , 3wt% NaF and the rest of the water, the helper plating temperature is 68°C, and the helper plating time is 100 seconds; in the drying step, hot air drying is adopted, the temperature is controlled at 100°C, and the time is 10 minutes; The hot-dipping solution adopted in the hot-dip step is: 6wt% aluminum, 1.2wt% nickel, 1.2wt% silicon, 0.5wt% magnesium, 0.9wt% manganese, 1.2wt% titanium and the zinc of the balance; The temperature of the hot-dip bath ...

Embodiment 3

[0016] The production process of hot-dip plating multi-component aluminum-zinc alloy on the surface of No. 45 steel includes pickling step, fluxing step, drying step, hot-dip step and passivation step, wherein the pickling solution used in the pickling step The hydrogen fluoride of 0.5wt%, the hydrogen chloride of 2.0wt%, the nitric acid of 0.3wt%, the urotropine of 0.6wt% and the water of balance; Pickling temperature is 15 ℃, pickling time is 25min; Described auxiliary The auxiliary agent that plating step adopts is: the NH of 10wt% 4 Cl, 5wt% ZnCl 2 , 5wt% MnCl 2 , 2wt% NaF and the rest of the water, the helper plating temperature is 63°C, and the helper plating time is 120 seconds; in the drying step, hot air drying is adopted, the temperature is controlled at 95°C, and the time is 15 minutes; The hot-dipping solution adopted in the hot-dip step is: 8wt% aluminum, 2.5wt% nickel, 0.5wt% silicon, 1.5wt% magnesium, 0.5wt% manganese, 1.5wt% titanium and the zinc of the balan...

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Abstract

The invention relates to a production process of multiple aluminum zinc alloy hot-dipped on the surface of carbon steel, which comprises the following steps of: pickling, assisting in plating, drying, hot-dipping and passivating. Hot-dipping liquid comprises the following components in percentage by weight: 6-8 weight percent of aluminum, 1.2-2.5 weight percent of nickel, 0.5-1.2 weight percent of silicon, 0.5-1.5 weight percent of magnesium, 0.5-0.9 weight percent of manganese, 1.2-1.5 weight percent of titanium and the balance of zinc; and passivating liquid comprises the following components in percentage by weight: 0.3-0.5 weight percent of titanium nitrate, 1.2-2.0 weight percent of hydrogen peroxide, 0.3-0.6 weight percent of phosphoric acid and 0.8-1.2 weight percent of citric acid. With the adoption of the production process, a hot-dipping carbon steel material which is excellent in corrosion resistance and particularly is excellent in corrosion resistance under humid environment can be prepared, and a prepared passivating protective film is uniform, level and compact and can effectively prevent the isolation of corrosion environment from zinc coating and effectively restrain the corrosion.

Description

technical field [0001] The invention relates to a hot-dip coating process, in particular to a production process for hot-dip coating a multi-element aluminum-zinc alloy on the surface of carbon steel. Background technique [0002] The current hot-dip aluminum-zinc-silicon alloy steel sheet is widely used in my country. Although its comprehensive performance such as corrosion resistance is nearly 5-6 times higher than that of pure hot-dip galvanized steel, it is suitable for buried pipelines, oceans and other harsh environments. However, its corrosion resistance still needs to be improved. The hot-dip multi-element aluminum-zinc alloy involved in the prior art mainly includes aluminum, silicon, rare earth and the balance of zinc, and may also include a certain proportion of additives such as zirconium, boron, titanium and other elements. Adding zirconium, boron, titanium and other elements can improve the corrosion resistance of aluminum-zinc alloys. [0003] In addition, si...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/26C23C2/02
Inventor 周然华
Owner 周然华
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