[en] In the unlikely event of a loss of coolant accident (LOCA) in a nuclear power plant, it would be necessary to avoid the complication of excessive hydrogen build-up in the containment. The size of recombiners needed to assist in controlling hydrogen accumulation depends in part on temperature-rate relationships of metal-water or metal-steam reactions such as: Zn + 2H₂O = Zn(OH)₂ + H₂ or 2Al + 3H₂O = Al₂O₃ + 3H₂. The metals are present as coatings, such as galvanizing or metal-rich paints used to protect steel used within the containment. In the normal course of events, these metal surfaces would corrode at negligible rates in the atmosphere, and H₂ release would be minimal, since they are exposed only to the air present in this part of the plant. In the case of a LOCA, high temperatures (up to 150⁰C) combined with high H₂O contents could prevail for various times, and safety spray systems would introduce aqueous sodium borate solutions at a pH of about 9 (PWR) or neutral water (BWR). In order to obtain bases for estimating corrosion rates, we have to rely on laboratory test data, since no actual field experience is available or likely to be in the near future. This report summarizes the work of several laboratories, and includes additional analyses of their data