Marine Corrosion Behavior of Ultra-high Strength Stainless Steel in Different Marine Regions
The work aims to study the natural corrosion behavior of Ferrium S53 steel and USS122G steel in the atmos-pheric and splash zone environments of Qingdao and Sanya marine regions.The corrosion behavior of Ferrium S53 steel and USS122G steel in the atmospheric and splash zone environments of the two marine regions was investigated by methods such as corrosion rate measurement,pitting depth analysis,three-dimensional optical microscopy,and three-dimensional atom probe analysis.After 1 year of exposure in the atmospheric and splash zone environments of Qingdao and Sanya,the annual average corrosion rate and average pitting depth of the both steels in atmospheric and splash zone environments of Qingdao were lower than those in Sanya.The annual average corrosion rate and average pitting depth of USS122G steel were lower than those of Ferrium S53 steel in both atmospheric and splash zone environments of Qingdao and Sanya.In the short term,USS122G steel demonstrates better corrosion resistance than Ferrium S53 steel in the above-mentioned marine regions.The main strengthening mechanisms of Ferrium S53 steel and USS122G steel differ and the former is based on M2C carbides,while the latter is based on Laves phase intermetallic compounds.The Cr element is more heavily concentrated in the M2C carbides,leading to lower Cr content in the depletion zones around the precipitates,resulting in poorer corrosion resistance for Ferrium S53 steel.
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