Cause of exfoliation of glass lining layer on stainless steel

The effect of the type of base metal on the exfoliation was examined, The c orrosion at the interface between the base metal and the ground coat layer was investigated by analyses of the interface and exfoliation surfaces. The cause of exfoliation was studied by analysis of stress distribution by the finite element method. The exfoliation Of the glass lining layer was obser ved only in the specimen using austenite stainless steel (SUS 304) as the b ase metal in the short turin. It was found that Si, Cr and Fe were present as oxides and Ni was absent at the exfoliation surface from the results, of MIS analysis on the exfoliation surface Of the base metal and the glass li ning layer the cause Of corrosion between the base metal and the ground coa t layer was speculated to be formation Of a part with low corrosion resista nce by, reaction between the ground coat glass and the spinel type oxide, ( NiO or FeO). Cr2O3. when SUS 304 is used as the base metal. The result uf stress distribution analysis by the finite element method showed that large shearing stress Was generated at the front Of Corrosion between the base m etal and the ground coat layer.