When applying fiberglass-reinforced plastic coatings or enclosures to stainless steel equipment, care should be taken to avoid crevice corrosion
Thread Content
The washing tank in the chlor-chemical section of a paper mill is made of 317L stainless steel, and the connecting bolts are made of 316L stainless steel. Since there is a common structural gap beneath the bolt head, gap corrosion is likely to occur in solutions containing chloride ions. So, the bolt heads were covered with fiberglass. The result was the opposite: corrosion became even worse. It indicates that lining the inner surface of metal containers with fiberglass reinforced plastic, and covering metal components with fiberglass reinforced plastic, is a common method for corrosion prevention. Its purpose is to isolate the metal from the corrosive environment. As long as the selected fiberglass-reinforced plastic has excellent corrosion resistance in the operating environment and the construction quality is ensured, good protective effects can be achieved. However, when applying fiberglass covering or cladding to stainless steel equipment, caution should be exercised, especially for partial coverage. This is because stainless steel is highly sensitive to crevice corrosion, and covering the bolt heads with fiberglass actually creates more severe crevice areas. During construction, adhesive sagging also caused many gaps.
Special attention is required when using fiberglass to cover or encase stainless steel equipment. Stainless steel is highly sensitive to crevice corrosion, and incorrect covering methods, such as covering only the bolt heads, can lead to more severe crevice corrosion problems. Proper construction techniques and the correct use of adhesives are also crucial to avoid creating new gaps. .