CUI may be influenced by the chemical nature of the insulation material. Some cladding materials contain free chlorides which may promote CUI. Chloride stress corrosion cracking should be considered for austenitic stainless steel at temperatures of 65oC and above. This is of particular importance for coastal sites and offshore installations where chloride contamination will be enhanced. For high carbon stainless steel grades at temperatures of 50oC and above, intergranular attack and chloride stress corrosion cracking cannot be ruled out. Insulating materials applied on zinc-rich coatings should preferably have neutral pH values as the coating may deteriorate in the presence of water with low or high pH values.

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