51314-3919-Hydrogen Induced Stress Corrosion of Duplex Stainless Steel Under Cathodic Protection in Artificial Seawater of Different Hydrostatic Pressure

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Product Number: 51314-3919-SG

ISBN: 3919 2014 CP

Author: Jing Wang

Publication Date: 2014

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Duplex stainless steel has been the optimized materials in subsea facilities because of the perfect chloride corrosion resistance. But duplex stainless steel used in deepwater will suffer from hydrogen induced stress corrosion (HISC) under cathodic protection especially effected by hydrostatic pressure and subsea temperature.Hydrogen absorption on surface of duplex stainless steels under cathodic protection was discussed in this work. Under different pressure hydrogen induced stress corrosion testing was carried by four-point bending test to investigate crack sensibility and morphology. Potentiodynamic polarizations were monitored by electronic corrosion testing machine to research hydrogen evolution in different environment.Crack morphology and scale of deposit on surface of stainless steels were observed by scanning electron microscope. Hydrogen content was measured by inert gas fusion infrared absorptionmetry. The results suggested that higher hydrostatic pressure accelerated hydrogen absorption on surface of duplex stainless steel and hydrogen evolution reaction was different in the deepwater of oxygen and free of oxygen.