The corrosion and heavy metal release of stainless steel EN1.4401 (SS 2347) into drinking water was studied using potentiodynamic sweeps and chronoamperometry together with test rigs located in four Swedish municipalities. The influence of the drinking water quality on the corrosion was found to be very low. The corrosion increased with increasing total carbonate content and increasing content of natural organic matter. The results imply the action of surface complexation. Heavy metal release in stagnant water was in the vicinity of the detection limit. Nickel leaching was observed on some occasions shortly after installation. The nickel release disappeared after a few weeks. Surface analysis of the internal pipe surface after 9-12 months of exposure revealed no indication of local corrosion.

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