Corrosion mechanism of Ti2AlC MAX phase coatings under the synergistic effects of water vapor and solid NaCl at 600 °C. (November 2021)

• Record Type: Journal Article
• Authors: Wang, Zhenyu; Ma, Guanshui; Li, Zhongchang; Ruan, Haitao; Yuan, Jianghuai; Wang, Li; Ke, Peiling; Wang, Aiying
• Is Part Of: Corrosion science. Volume 192(2021)
• Publication Date: 2021-11
• Subjects: A. Sputtered films -- A. Ceramic -- B. STEM -- C. Interface -- C. High temperature corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109788
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behavior of Ti2 AlC MAX phase coatings coated on 1Cr11Ni2W2MoV substrates in NaCl deposit in water vapor at 600 °C has been fully investigated. The results demonstrated that the substrates underwent serious corrosion, but the coatings performed better. The mass gain per unit area of coatings was less than 1/6 of substrates, because of the formed compact and uniform corrosion scale. Such dense corrosion scale was composed of Na x Ti y O z fine grains with the size of 11 ± 0.4 nm and amorphous Al2 O3 phases which self-healed the generated defects during corrosion, benefiting from the novel layered structure of MAX phase. Graphical Abstract: ga1 Highlights: Dense and high-purity Ti2 AlC coatings were fabricated by a facile two-step technique. The mass gain per unit area of coatings was less than 1/6 of 1Cr11Ni2W2MoV substrates. Corrosion mechanism of Ti2 AlC coatings under NaCl-H2 O was completely investigated. Defects of corrosion scale were self-healed during corrosion by inert Al2 O3 tissue. Weakly-boned Al of Ti2 AlC coatings essentially favored their corrosion resistance.