Abstract
To explore the corrosion behavior of carbon steel at medium hydrofluoric acid concentration, the corrosion and stress corrosion cracking behavior of Q345R in 40 wt.% hydrofluoric acid are investigated. An almost constant corrosion rate is observed which is attributed to the loose structure of corrosion products that cannot prevent fluorion from penetrating. Pits are found as a consequence of hydrogen escaping and uneven distribution of corrosion products. These pits transform into cracks during stress corrosion cracking, and the higher the stress, the shorter the pit-to-crack transition time, while the change in crack propagation rate with stress is different.
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