Analysis of corrosion causes

This post was last edited by Wang Genrong on 2016-7-11 at 17:38. SCC is the abbreviation for Stress Corrosion Cracking, which means stress corrosion cracking. Stress corrosion cracking is one of the main forms of damage in corrosion accidents of metal components, and it poses a severe threat to production. Definition of SCC: The cracking or fracturing of metals under the combined effect of stress and chemical agents is known as metal stress corrosion cracking or metal corrosion fracture. It exhibits different forms of corrosion failure depending on the stress condition; for example, corrosion failure that occurs under alternating stress is known as corrosion fatigue. SCC is characterized by the formation of corrosive mechanical cracks, which can develop along grain boundaries or spread through the grains. Since crack propagation occurs within the metal, it reduces the strength of the metal structure; in severe cases, sudden failure can occur. SCC occurs under certain conditions, and these are: certain tensile stress or residual stress within the metal ； Metals or alloys are sensitive to stress corrosion ； There are media that can cause stress corrosion in this metal or alloy. The control measures for SCC include: 1. Avoid combining SCC-sensitive materials with corresponding media during engineering design. 2. Eliminate internal stresses in metal components during manufacturing, such as through heat treatment and reducing weld excess height. 3. Avoid the accumulation of harmful ions (such as chloride ions) during use; for example, clean promptly to prevent the evaporation and concentration of residual liquids.