How to prevent corrosion of high temperature and high pressure dyeing machine?

1. Selection of stress corrosion resistant materials

In recent years, a variety of stress corrosion-resistant stainless steels have been developed, mainly including high-purity austenitic chromium-nickel steel, high-silicon austenitic chromium-nickel steel, high-chromium-nickel ferritic steel and ferro-austenitic dual-phase steel. Among them, the stress corrosion resistance of ferritic-austenitic dual-phase steel is better. Control stress When assembling pressure vessels, minimize stress concentration and use the part that is in contact with the medium to have the smallest residual stress. Prevent bumps and scratches.
2. Removal of oligomers, high-temperature and high-pressure dyeing machines are often washed with NaOH or acid sulfite detergent. Carriers can also be added to help dissolve oligomers. Adding high-temperature-resistant dispersants can inhibit oligomers Precipitation, rapid cooling and high temperature drainage can prevent the deposition and aggregation of oligomers.

3. The removal of alkali scale, calcium salt and lint can be cleaned with hydrochloric acid or sulfuric acid, and the effect is very good, but it has obvious effects on stainless steel (corrosion-resistant stainless steel is generally used for the inner wall of the dyeing vat), and the luster of the chrome plating layer disappears completely, which is very corrosive. big. It is recommended to use Transfar's TF-105F tank cleaning agent, which does not contain strong acid and is not corrosive to the tank body, and the tank cleaning effect is excellent.

4. Take basic precautions

However, in long-term use, due to the joint action of various intricate factors, the container will also be subject to certain corrosion. Although the current method of preventing chloride ions from corroding stainless steel is not perfect, some basic protective measures must be mastered. It is very important to ensure the normal progress of production.

5. Strengthen the maintenance management of equipment

In the normal production process, the operating procedures should be strictly followed, equipment management should be strengthened, and regular inspections of containers should be done well to ensure that the containers can operate safely within a reasonable life span. The maintenance and management of equipment is a powerful guarantee for the long-term safe operation of pressure vessels. The regulations and regulations on the reverse side of pressure vessels should be strictly implemented. Review the allowable defects in the high-temperature and high-pressure dyeing machine, grasp the development of defects in operation in time, and take appropriate measures to reduce equipment corrosion.