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

1. Select 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 body steel and ferrite-austenite dual-phase steel. Among them, the ferrite-austenite dual-phase steel has better stress corrosion resistance. Control stress When assembling the pressure vessel, minimize stress concentration and use the part in contact with the medium with small residual stress. Prevent bumps and scratches.

2. Removal of oligomers, high temperature and high pressure dyeing machines often use NaOH or acid sulfite detergent to wash the tank, and a carrier can also be added to help the dissolution of oligomers, and adding a high temperature-resistant dispersant can inhibit oligomers The precipitation, rapid cooling and high temperature drainage can prevent the deposition and agglomeration 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 a significant impact on stainless steel (corrosion-resistant stainless steel is generally used for the inner wall of the dye vat). Big. It is recommended to use Transfar's TF-105F cylinder cleaning agent, which does not contain strong acid, is not corrosive to the cylinder body, and has an excellent cylinder cleaning effect.

4. Take basic protective measures

However, in the long-term use, due to the combined action of various intricate factors, the container will also be corroded to a certain extent. Although the method to prevent chloride ions from corroding stainless steel is not yet perfect, master some basic protective measures. It is very important to ensure the normal operation of production.

5. Strengthen the maintenance management of equipment

In the normal production process, it is necessary to strictly follow the operating procedures, strengthen equipment management, and conduct regular inspections of containers to ensure that the containers can operate safely within a reasonable life period. The maintenance and management of equipment is a powerful guarantee for the long-term safe operation of pressure vessels. Regulations and regulations on the reverse side of pressure vessels should be strictly enforced. Review the defects that are allowed in the use of high temperature and high pressure dyeing machines, grasp the development of defects in operation in time, and take appropriate measures to reduce equipment corrosion.