An effective and widely used corrosion prevention method is obtained through a modification, often called conditioning, of the aggressive environment. The rationale of the approach is to influence cathodic or anodic processes or both, in order to decrease the corrosion rate below an acceptable limit to meet the design requirement about design life and safety. The main actions, illustrated in the following, are based on the modification of pH, the reduction of oxygen content to slow down the cathodic process, the use of biocides to control microbiological activity, or on the injection of specific chemicals, as scaling agents and corrosion inhibitors, to slow down both anodic and cathodic processes. In particular, for corrosion inhibitors, the mechanism (anodic, cathodic, mixed) is described and the effectiveness is discussed.
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