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Environment-friendly surface-treated galvanized steel sheet and preparation method thereof

A galvanized steel sheet, surface treatment technology, applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of poor surface quality, low anti-rust ability, bad appearance, etc., to reduce the friction coefficient, Excellent formability and improved formability

Active Publication Date: 2021-12-07
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution has poor surface quality and low rust resistance in practical applications
[0008] US Patent US 6991688B2 published on January 31, 2006 discloses a method for preparing a surface-treated galvanized steel sheet, which overcomes the The poor appearance caused by the white zinc oxalate precipitation and the reduction of the temporary anti-rust ability caused by the residual acid on the surface, in order to achieve these goals, the invention limits the composition of the solution to 5×10-3-0.1 mol / L oxalic acid, 10-6-10-2mol / L heavy metal ions (such as Ni, Cu, etc.)
However, the use of heavy metal ions increases the pressure of environmental protection
[0009] In summary, the existing technology has excellent temporary anti-rust ability, lubricating performance, welding performance, adhesive performance, coating performance, and environmentally friendly technical solutions does not exist

Method used

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  • Environment-friendly surface-treated galvanized steel sheet and preparation method thereof
  • Environment-friendly surface-treated galvanized steel sheet and preparation method thereof
  • Environment-friendly surface-treated galvanized steel sheet and preparation method thereof

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Embodiment 1- Embodiment 7

[0044] An environment-friendly surface-treated galvanized steel sheet, which sequentially includes a galvanized layer, a chemical conversion film and an antirust layer.

[0045] The preparation method of the galvanized steel sheet with environment-friendly surface treatment described in embodiment 1-embodiment 7 comprises the following technological process:

[0046] 1) The steel plate is obtained by cold rolling → cleaning → annealing → galvanizing → smoothing to obtain a galvanized steel sheet; the formed galvanized layer includes the following components by mass percentage: Al0.25%, the balance is Zn and unavoidable impurities;

[0047] 2) The method of roller coating is used to uniformly coat the aqueous solution containing one or more of malonic acid, succinic acid, adipic acid, tartaric acid, citric acid or malic acid as a lubricating solution on the surface of the galvanized layer of the galvanized steel sheet, And heat treatment with hot air, heating and baking the ste...

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Abstract

The invention provides an environment-friendly surface-treated galvanized steel sheet and a preparation method thereof, and compared with the prior art, the environment-friendly surface-treated galvanized steel sheet provided by the invention comprises a galvanized coating, a chemical conversion layer and an antirust coat, wherein the chemical conversion layer is obtained by drying a linear saturated carboxylic acid solution containing 3-6 carbon atoms under the conditions that the temperature is 90-140 DEG C and the heating time is 3-10 seconds. The product is environment-friendly and has the characteristics of excellent temporary rust resistance, lubricating property, welding property, adhesive property and coating property.

Description

technical field [0001] The invention belongs to the field of galvanized steel sheets, and in particular relates to an environment-friendly surface-treated galvanized steel sheet and a preparation method thereof. Background technique [0002] Galvanized steel sheets are widely used in the automotive industry due to their excellent corrosion resistance. During the forming process of galvanized steel sheet, friction occurs between the softer zinc layer and the mold, which can easily cause the zinc layer to fall off, and form zinc powder accumulation on the mold, which will cause damage to the surface of the part during the subsequent stamping process. Since auto parts, especially outer coverings such as doors and hoods, have extremely high requirements on the appearance quality of the coating, damage to the surface of the parts is not allowed. Therefore, it is necessary to stop the line to clean the mold during the production process, which reduces the production efficiency. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/40C23C2/26C23C22/53
CPCC23C2/06C23C2/40C23C2/26C23C22/53
Inventor 李子涛单梅王辉崔磊计遥遥刘永刚詹华张军
Owner MAANSHAN IRON & STEEL CO LTD
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