How to avoid oxidation problems in Dalian blackening surface treatment?

Dalian blackening surface treatment is a common metal surface treatment process, mainly used to improve the corrosion resistance, wear resistance, and aesthetics of metals. However, during the blackening process, the metal surface is prone to oxidation, which affects the treatment effect and product quality. Therefore, how to avoid oxidation problems is a key step in blackening surface treatment. The following discusses in detail how to avoid oxidation problems from the aspects of process control, material selection, environmental management, and post-treatment.

1、 Process control

Strictly control temperature and time

Blackening treatment usually needs to be carried out under high temperature conditions, and excessive temperature or treatment time can lead to excessive oxidation of the metal surface. Therefore, it is necessary to select a suitable temperature range (usually 130 ° C150 ° C) and processing time (usually 3060 minutes) based on the characteristics of the metal material, and monitor process parameters in real time to ensure stable processing.

Use appropriate blackening agent

The quality of blackening agent directly affects the treatment effect. High quality blackening agents can effectively prevent metal surface oxidation and form a uniform and dense black oxide film. When choosing a blackening agent, attention should be paid to its composition and performance, and low-quality or expired products should be avoided.

Optimize the processing flow

Blackening treatment usually includes steps such as cleaning, acid washing, blackening, neutralization, and sealing. Each step must be strictly operated according to the process requirements to avoid oxidation caused by improper procedures. For example, incomplete cleaning can leave impurities, excessive acid washing can damage metal surfaces, and insufficient neutralization can leave acidic substances, all of which increase the risk of oxidation.

2、 Material selection

Choose suitable metal materials

The oxidation properties of different metal materials vary. For example, carbon steel and cast iron are more prone to oxidation, while stainless steel and aluminum alloys are relatively resistant to oxidation. Therefore, when selecting materials, suitable metals should be chosen according to actual needs, and targeted oxidation prevention measures should be taken during blackening treatment.

Pre treated metal surface

Before blackening treatment, the metal surface should be thoroughly pre treated, such as grinding, polishing, degreasing, rust removal, etc., to ensure a clean and smooth surface and reduce the residue and generation of oxides.

3、 Environmental management

Control environmental humidity

High humidity environments can accelerate the oxidation reaction on metal surfaces. Therefore, blackening treatment should be carried out in a dry and ventilated environment, and dehumidification equipment can be used to control humidity if necessary.

Avoid air pollution

Pollutants in the air, such as sulfides and chlorides, can react with metal surfaces, leading to oxidation. Therefore, the blackening treatment workshop should be kept clean to avoid the invasion of harmful gases.

Prevent contact with moisture during processing

During the blackening process, the metal surface should avoid contact with moisture, especially under high temperature conditions. Moisture will react with metals to form oxides, affecting the blackening effect.

4、 Post processing

Timely conduct closure treatment

After blackening treatment, a black oxide film will form on the metal surface, but this film may have micropores or defects, which are easily affected by the external environment and oxidized. Therefore, timely sealing treatment should be carried out, such as oil coating, wax coating or spraying protective layer, to enhance the density and corrosion resistance of the oxide film.

Avoid storing in high temperature or high humidity environments

The product after blackening treatment should be stored in a dry and ventilated environment, avoiding prolonged exposure to high temperature or high humidity conditions to prevent damage to the oxide film.

Regular inspection and maintenance

For blackened products that have been used for a long time, their surface condition should be regularly inspected to promptly detect and address oxidation issues. For example, regular oiling or resealing can be carried out to extend the service life of the product.

5、 Other precautions

Operator training

Blackening treatment is a highly technical task, and operators need to undergo professional training, familiarize themselves with the process flow and anti oxidation measures, to avoid oxidation problems caused by improper operation.

Equipment maintenance

Blackening treatment equipment (such as heating furnaces, cleaning tanks, etc.) should be regularly maintained to ensure stable performance. For example, the temperature control system of the heating furnace needs to be calibrated regularly, and the solution in the cleaning tank needs to be replaced regularly to avoid affecting the treatment effect due to equipment problems.

Quality Inspection

The product after blackening treatment should undergo strict quality testing, such as oxide film thickness, adhesion, corrosion resistance, etc., to ensure that it meets the standard requirements. For non-conforming products, the reasons should be analyzed in a timely manner and improvement measures should be taken.

To avoid oxidation problems in blackening surface treatment, comprehensive measures need to be taken from multiple aspects such as process control, material selection, environmental management, and post-treatment. By strictly controlling process parameters, optimizing processing procedures, selecting high-quality materials, controlling environmental conditions, and strengthening post-treatment, the occurrence of oxidation problems can be effectively reduced, and the quality and product performance of blackening treatment can be improved. At the same time, the professional quality of operators and the maintenance and management of equipment are also important factors in ensuring the effectiveness of blackening treatment. In actual production, enterprises should develop reasonable oxidation prevention plans based on specific situations, and continuously optimize and improve them to meet market demand and customer requirements.