The reproducibility of corrosion testing in supercritical water—Results of a second international interlaboratory comparison exercise

Supercritical water-cooled reactor candidate materials are typically corrosion-resistant alloys whose mass changes in supercritical water fluctuate around zero. A previous interlaboratory corrosion experiment exercise revealed large scatter change results between laboratories. Here, we reduced systemic differences laboratories by unilateral preparation of coupons and chemical cleaning. Type 310S stainless steel Alloy 800HT test were exposed for 1000 h to 550 °C, 25 MPa, deaerated water. Average loss was 38 ± 26 51 31 mg/dm2, respectively. Differences transfer, galvanic local corrosion, average coupon temperature may explain the poor reproducibility.