Relationship between stress and corrosion
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Dear sea friends, I came across a sentence today that says, “The greater the stress, the more corrosion occurs.” How should we understand this? Let me share my personal opinion first: In areas with higher stress levels, the materials become more active due to that stress. If suitable external conditions are present, corrosion may occur; the phrase \"dry kindling and fierce fire\" is a good way to describe this. What do you all think? Please share your opinion.
I’ve learned it – does this cover all situations?
At the microscopic level (nanoscale), the greater the stress, the more the atoms in the metal lattice deviate from their equilibrium positions. This results in higher energy storage, increased activity of those atoms, and a greater tendency to lose electrons and thus participate in corrosion reactions. Mesoscopic to macroscopic scale: At the sites where corrosion occurs, the combined effect of tensile stress prevents the adhesion of corrosion products, causing them to flake off and revealing the fresh metal surface. If the stress reaches a certain level, the metal may also undergo local plastic deformation; combined with the effect of corrosive agents, this can lead to the formation of local microcracks. Under the combined effect of stress and corrosion, the crack tip continues to grow, leading to stress corrosion cracking. In general, stress corrosion cracking has two elements: 1. a corrosive environment, and 2. sufficient stress.