Control method for painting shrinkage cavity defect of tin-plated plate

A control method and technology of tin-plated plate are applied in the field of coating and coating to achieve the effect that the control method is simple and easy to implement

Pending Publication Date: 2022-02-25
SHAGANG GROUP +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Although the above prior art can predict the paint wettability of tinplate or partially im...

Method used

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Embodiment 1

[0022] Tinplate production process: 1) With low-carbon cold-rolled steel plate as the substrate, the conventional process is used for alkali cleaning and annealing, and then the double-stand tempering machine and the dry-leveling process without leveling liquid are adopted, and the 1# frame leveling roll Roll surface roughness Ra is 1.5 μm, surface peak density RPc is 100 pieces / cm, surface roughness Ra of 2# frame leveling roll is 0.6 μm, surface peak density RPc is 200 pieces / cm, and then obtained by coil Substrate; 2) The tin-plated substrate is subjected to alkali cleaning, pickling, electroplating, fluxing, and reflowing by conventional processes, and then two passivation tanks are used for passivation. The passivation method is electrochemical passivation, and the passivation temperature is 42 ℃, the concentration of sodium dichromate in the passivation solution is 20g / L, the pH value of the passivation solution is 4.5, and the charge density of 1# passivation tank is 1.2...

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Abstract

The invention belongs to the technical field of coating layers, and discloses a method for controlling the painting shrinkage cavity defect of a tin-plated plate. According to the method, a layer of surface structure with good coating property is formed on the surface of the tin-plated plate by controlling a leveling process of the surface structure of the tin-plated plate and controlling a passivation and drying process of a passivation film layer on the surface of the tin-plated plate; the surface structure is composed of a passive film and an oil film, the surface roughness Ra is 0.4-0.6 [mu] m, and the surface peak density RPc is 70-90 pieces/cm; and the surface oxidation degree is reduced by controlling the storage environment of the tin-plated plate after shearing and before printing and coating, so that good wettability is kept, it is ensured that the surface of the tin-plated plate has good coating performance before coating, and the problem of painting shrinkage of the tin-plated plate is solved fundamentally. The control method disclosed by the invention is simple and easy to implement, can meet the requirements of coating the tin-plated plate with coatings such as white coating and golden yellow base oil and can be used in factories in southern humid and hot environments, and the occurrence rate of shrinkage cavities is greatly reduced to 0.02% or below from 0.5% compared with that of a traditional process.

Description

technical field [0001] The invention belongs to the technical field of coating and coating, and in particular relates to a method for controlling shrinkage cavity defects in tin plate coating. Background technique [0002] Paint shrinkage is a common defect of tinplate in the process of iron printing coating. It is manifested by the shrinkage of paint at local positions to form small holes. The root cause is that the paint has poor wetting of the substrate. Due to the variety of paints, there are differences in the wetting ability of the substrate. , and the production conditions of different iron printing production lines are uneven, which leads to the frequent occurrence of shrinkage cavities, especially in the hot and humid weather in the south, where the incidence of shrinkage cavities is higher, and it is difficult to completely distinguish whether the shrinkage is caused by the steel plate raw material or the iron printing production process. [0003] The existing tech...

Claims

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Application Information

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IPC IPC(8): C25D3/30B05D7/14C23F11/02C25D5/36C25D5/48C25D7/06C25D11/38
CPCC25D3/30C25D5/36C25D5/48C25D7/0614C25D11/38B05D7/14C23F11/02
Inventor 黄久贵宋乙峰赵奇少
Owner SHAGANG GROUP
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