STIMULATION OF AQUEOUS CORROSION BY MOS2 DEPOSITS

The paper describes investigations concerning the damage of a tube rea ctor made of 2 Cr 1 Mo steel and its enhancement due to MoS2 deposits. The damaged tube sheets of the reactor were investigated and laborato ry tests with the low alloy steel welded to a high alloy steel were co nducted in order to clarify the corrosion mechanism. The results show that the presence of an electrolyte in the form of water and the direc t contact between the low alloy and high alloy steel lead to the corro sion of the low alloy tube sheets. In addition, the presence of MoS2 r emarkably enhanced the corrosion rate due to the stimulation of the ca thodic partial reaction of oxygen reduction.