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应力腐蚀开裂是应力和电化学环境的协同作用的结果。应力腐蚀开裂分两种形式,一种是高pH值应力腐蚀开裂,环境pH值接近9;另一种是低pH值应力腐蚀开裂,环境pH值在5.5至7之间。管道的高pH值应力腐蚀开裂电化学反应形成氧化铁膜粘附在钢表面,可保护管子不受裂纹环境影响,但氧化铁膜破裂将促使裂纹形成或增大。对腐蚀开裂的检测应集中在裂纹密集区,或异形和分支裂纹区。
Stress corrosion cracking is a result of the synergistic effect of stress and electrochemical environment. Stress corrosion cracking in two forms, one is high pH stress corrosion cracking, the environment pH value close to 9; the other is a low pH stress corrosion cracking, the environment pH value between 5.5 to 7. High pH of pipe Stress corrosion cracking Electrochemical reactions form iron oxide film adhering to the steel surface, which protects the pipe from the cracking environment, but rupture of the iron oxide film causes cracks to form or increase. The detection of corrosion cracking should be concentrated in the crack-intensive areas, or shaped and branched crack zone.