Difference between heartwood and sapwood
Forest Products Laboratory (U.S.)
1919
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External corrosion is one of the most common causes of oilwell casing failure. Hostile
environments can be due to acidizing treatments. Although it is common to add corrosion inhibitors
and oxygen scavengers in acidic solutions to control external casing corrosion, their real efficiency
is unknown yet. Therefore, it is important to establish how aggressive to steel are the different
hostile environments to help decide which acidic systems can be used. A comparative evaluation of
the corrosion of steel immersed in hardened cement slurries submitted to commonly acidizing
agents is suggested. The performance of Special Class Portland Cement Slurries reinforced with
polished SAE 1045 steel was evaluated by electrochemical measurements as a function of time.
Open circuit potential, polarization curves and electrochemical impedance spectrosc...
