Effect of molybdenum additions on the microstructures and corrosion behaviours of 316L stainless steel-based alloys. (3rd April 2018)

• Record Type: Journal Article
• Authors: Rahman, T.; Ebert, W. L.; Indacochea, J. E.
• Is Part Of: Corrosion engineering, science, and technology. Volume 53:Number 3(2018)
• Page Start: 226
• Page End: 233
• Publication Date: 2018-04-03
• Subjects: Stainless steel -- sigma phase -- Laves phase -- potentiodynamic polarisation -- corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2018.1443991
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: Alloys were made by alloying 5, 10, 15, 17.5 and 20 wt-% Mo with Type 316L stainless steel. Sigma phases containing 21–29 wt-% Mo formed along the austenite grain boundaries with the addition of 5 wt-% Mo and increased with additions up to 15 wt-% Mo, but they decreased with further additions. Laves phases containing 33–40 wt-% Mo co-precipitated at additions of 10 wt-% Mo which increased with further Mo increases. The corrosion resistance, assessed by potentiodynamic polarisation in a 10 mM NaCl solution adjusted to pH 4, increased relative to Type 316L for alloys made with 5 and 10 wt-% added Mo, but decreased with further additions due to preferential corrosion of the Laves phase. The alloy made with 10 wt-% added Mo had the highest corrosion resistance due primarily to the high Mo content of the austenite.