CARBON STEEL SURFACES PROTECTION METHOD AT HEAVY WATER OBTAINING INSTALLATIONS

摘要

The process comprises cleaning of the steel surface with 3% Na0H at 68-70 deg.C. for 24 hrs. for contacting with demineralised water of initial pH 8.5-9.5, with addition of 1- power -2 - 10 power -4 mol/litre of Na0H. Saturation with hydrogen sulphide (99% purity) at 100-130 deg.C. and 15 bar for 30-40 days, gives up to 10% hydrogen content in the gas phase. The resulting protective film decreases the transport of iron in the plant.