Abstract
Super 13Cr martensitic stainless steel (UNS S41426, S13Cr MSS in the case) developed for gas fields is being applied more broadly. However, the stress corrosion cracking induced by pitting limits its application range. To enhance the corrosion resistance, a new amorphous film was pre-formed on its surface by a modified alkaline solution. The nanoscale amorphous film contained FeO, Fe2O3, Cr2O3 and Cr(OH)3, growing logarithmically after a short dissolution duration. The general corrosion resistance of S13Cr MSS improved significantly, as evidenced by a decrease in corrosion current density by an order of magnitude. Additionally, the pitting potential of S13Cr MSS increased by nearly 100 %. This work provides a strategy for addressing surface defects in S13Cr MSS.
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