The importance of thermogalvanic corrosion mechanism in supercritical aqueous solutions is demonstrated. Large temperature gradients in the reactors coupled with the changes in the aohrtion conductivity and density around critical point of water result in the formation of the therrnogalvanic concentration cells. The therrnogalvanic concentration cells contribute to the remarkable spatial distritartion of the corrosion damage in SCWO systems. Approaches to the mitigation of mrrosion in SCWO based on the thermogalvanic corrosion mechanism are discussed. Keywords: corrosion in supercritical water, supercritical water oxidation of waste (SCWO), thermogalvanic corrosion.