Corrosion Potential of Metal Materials in Simulated Deep Sea

A self-developed multi-channel automatic potential acquisition device was used to monitor the corrosion potential of 19 kinds of metal materials in the simulated deep sea at a pressure of 8 MPa. The change rule of corrosion potential was analyzed, and the corrosion potential series of metal materials in simulated deep sea was given. The results showed that the potential of carbon steels, low alloy steels, aluminum alloys, copper alloys and aluminum anodewas stable rapidly and the potential fluctuation was small. The corrosion potential of stainless steels and nickel base alloys was positive at the beginning of the test. The corrosion potential versus immersion time decreased obviously and the potential change range was larger. In the simulated deep-sea environment, only activated stable potentials existed in the metal materials. The steady corrosion potentials of tested metallic materials can be ranked as a series from low to high as:aluminum anode, aluminum alloys, iron castings, carbon and low alloy steels, copper alloys, stainless steels and nickel base alloys.