An impingement jet system was used to study the corrosion of API X65 steel in a wet CO 2 -containing environment via electrochemical tests, surface analysis technique and computational fluid dynamics simulation. The corrosion rate decreased in the wet environment compared to that in the bulk solution. When under flow condition, corrosion rate increased with the flowing velocity, especially when above the critical flowing velocity. Continuous electrolyte film was formed and electrochemical reaction started to occur in about 70% RH, and the critical RH appeared at 70-80%, above which pit size and amount remarkably increased with flow velocity.
Purpose
The purpose of this paper was to study the relationship between safe storage life and storage mode of hot-rolled sheet (Q235, X70) in humid environment, and a prediction model of safe storage life under different storage modes was established.
Design/methodology/approach
The corrosion behavior of hot-rolled sheets under different storage conditions was studied with immersion experiment and morphology observation.
Findings
The results show that pitting occurs on the hot-rolled sheets in humid environment, and the corrosion behavior is strongly related with the storage mode. When they are stored separately, the number and depth of pits first increase and then decrease as the Cl− concentration rises, while for the stack storage, pit depth increases with increasing Cl− concentration. The safe storage time of separate storage is longer than that of stack storage. Based on this, a model of chloride ion concentration and storage life was established.
Originality/value
A storage safe life model of hot-rolled sheet in humid environment is proposed.
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