Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 74, Issue -, Pages 7-13Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2018.02.019
Keywords
High-velocity oxygen-fuel; Slurry erosion; Microbial influenced corrosion; Sulfate-reducing bacteria; WC-10Co-4Cr
Funding
- National Natural Science Foundation of China [51609067, 51579087, 51339005]
- Natural Science Foundation of Jiangsu Province of China [BK20150806]
- China Postdoctoral Science Foundation [2016M590404]
- Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province [2016CL08]
- Opening Project of CAS Key Laboratory of Nuclear Materials and Safety Assessment [2016NMSAKF03]
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The slurry erosion-corrosion and microbial corrosion electrochemical behavior of high-velocity oxygen-fuel (HVOF) sprayed WC-10Co-4Cr cermet coatings and the reference stainless steel 1Cr18Ni9Ti were both investigated. The slurry erosion-corrosion test was performed in a rotating disk rig facility with circulating system using distilled water and 3.5 wt% NaCl slurries. The microbial influenced corrosion behavior in the presence of SRB was evaluated by electrochemical measurement. The results showed that WC-10Co-4Cr coating exhibited higher slurry erosion-corrosion resistance compared to the stainless steel 1Cr18Ni9Ti in both distilled water and 3.5 wt% NaCl slurries. The evolution of the slurry erosion mechanism of the coatings with the augment of NaCl concentration was cracks and microchipping in distilled water slurry, and a combination of detachment of binder phase, microchipping and fragments in 3.5 wt% NaCl slurry. Potentiodynamic polarization and electrochemical impendence spectroscopy (EIS) results showed that the WC-10Co-4Cr coating had a comparable microbial influenced corrosion resistance in seawater with SRB as compared to the stainless steel 1Cr18Ni9Ti.
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