Case studies of corrosion repair for chemical processing equipment

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Corrosion is a major threat to safety. With economic development, the demand for chemical products continues to rise, and more and more production equipment is operating beyond its designed capacity. As a result, for chemical companies around the world, it has become an urgent issue to prevent failures caused by corrosion of process equipment, which could lead to losses. Many experts believe that material protection and anti-corrosion measures are essential for reducing maintenance costs and ensuring the safe and stable operation of factories. The types of corrosion and the forms of metal corrosion in corrosive media can be divided into two main categories: first, uniform corrosion across the entire surface of the equipment; second, local corrosion (pitting, crevice corrosion, intergranular corrosion, stress corrosion cracking, corrosion fatigue, hydrogen-induced cracking, wear corrosion, delamination corrosion, etc.). There are many types of corrosive agents present in the production process, but the most common and significant ones can be classified into several categories: 1. Chloride corrosion, 2. Sulfide corrosion, 3. Hydrogen damage, 4. Nitrides, 5. Oxygen corrosion, 6. Corrosion by organic solvents, 7. Corrosion by acid and alkali chemical reagents, etc. Polymer composite materials, which are solutions for equipment corrosion, are materials formed by combining polymer resins, ultra-fine powders of metals or ceramics, fibers, etc., under the action of curing agents and curing accelerators. The various materials complement each other in terms of performance, creating a synergistic effect that results in the composite material having superior overall properties compared to its constituent materials. It possesses excellent adhesion, mechanical strength, and chemical resistance, which enables its wide use in repairing mechanical wear, scratches, dents, cracks, leaks, and casting defects on metal equipment. It is also utilized for the chemical corrosion protection and repair of various chemical storage tanks, reaction vessels, and pipelines. Case Appreciation