Abstract
Al 2O 3 and Al 2O 3–13wt.% TiO 2 ceramic coatings were prepared on 21Cr–6Ni–9Mn austenitic stainless steel substrates by plasma spraying. The phase contents and microstructures of the plasma-sprayed coatings were investigated by means of X-ray diffraction (XRD), electron probe microanalysis (EPMA) and scanning electron microscopy (SEM). Also, the hydrogen permeation resistance was measured by thermal hydrogen charging. The results showed that plasma-sprayed Al 2O 3 and Al 2O 3–13wt.% TiO 2 ceramic coatings can improve the hydrogen permeation resistance of 21Cr–6Ni–9Mn austenitic stainless steel effectively, and the hydrogen resistance efficiency of Al 2O 3 coating was higher than that of Al 2O 3–13wt.% TiO 2 coating. Al 2O 3 coating displayed a denser structure than Al 2O 3–13wt.% TiO 2 coating. The phase contents analysis revealed that the presence of the Ni(Cr, Fe, Ti) 2O 4 phase in the Al 2O 3–13wt.% TiO 2 coating in addition to γ-Al 2O 3 and α-Al 2O 3. It was found that the bonding between the plasma-sprayed ceramic coatings and austenitic stainless steel substrates was mechanical rather than metallurgical.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
