CORROSION AND EROSIONCORROSION WEAR RESISTANCE OF ROTATING COMPONENTS MADE FROM USN S43100 (1.4057) STEEL UNDER CONTROLLED POTENTIALS

Rotating components in pumps are subjected to the highest degree of wear in case multiphase fluids containing corrosive elements as well as erosion particles are to be transported. The wear of these components leads to an increasing loss of efficiency and eventually to the failure of the pump. If the pump is to be used as a stand-alone system such as in ultradeep subsea applications in the oil and gas production industry, the wear has to be minimized. In this paper the wear resistance of USN S43100 steel as a rotating test sample with and without erosion particles in standardised formation water with CO₂ is investigated under controlled potentials around the corrosion potential on both the anodic and the cathodic side. As a result it will be shown, that the metal loss of a rotation component is ten times higher than the metal loss of a identical, fixed component in the same environment. Furthermore it will be shown, that the corrosion potential is highly influenced by the presence of erosion particles. In the case of anodic dissolution, pitting corrosion was found to be the prevalent cause for the metal loss.