Metal corrosion beneath the insulation layer of equipment
Thread Content
Since the insulation materials contain water-absorbing substances such as K2O and Na2O, these substances undergo chemical reactions with the moisture in the air, absorbing large amounts of water. This can easily lead to a siphoning effect that moistens the insulation material. The presence of soluble salts in the insulation materials further enhances the condensation of water within them. The adsorption and condensation of water make the insulation material humid, while the dissolution of soluble substances turns the water film into a strong electrolyte solution, leading to electrochemical corrosion of the metal. Due to inadequate anti-corrosion measures for metal surfaces in such operating environments, premature corrosion of the metal surfaces occurred. See the following image for details:
Insulation materials contain water-absorbing substances that react with moisture in the air to absorb it, causing the insulation material to become wet; the presence of soluble salts enhances the aggregation of moisture. Moisture and the dissolution of soluble substances form strong electrolyte solutions, triggering the electrochemical corrosion of metals. Corrosion prevention measures on the metal surface were not implemented effectively, resulting in premature corrosion of the metal surface. .
Thank you for sharing the information; the forum is even better with you here!
:victory::victory:
I have indeed encountered similar situations; is there any solution?
It’s better to choose moisture-proof insulation materials; those that accumulate condensation on their surface throughout the year, and if they are also absorbent, it is very likely to lead to extensive corrosion
Metal corrosion beneath the insulation layer of equipment