Corrosion behavior of ceramic structural materials in an electrolytic reduction process

Figures & data

Table 1. Characteristics of ceramic materials.

Material	Product	Composition (wt%)	Bulk density (g/cm^3)	Coefficient of linear thermal expansion (× 10^−6/K)
Al6Si2O13	Nikkato Co. KM	Al2O3 = 60, SiO2 = 37, K2O = 0.8, etc.	2.7	5.6
CaO-stabilized ZrO2	Nikkato Co. Zr-11	ZrO2 > 93, CaO = 5.5	5.4	10

Figure 1. Schematic diagram of the apparatus for the corrosion test.

Figure 2. Weight losses from the ceramic structural materials corroded at 650°C for 168 h.

Figure 3. XRD patterns of the surface corrosion layer of mullite corroded at 650°C for 168 h: (a) in 1 wt% Li₂O–LiCl, (b) in 3 wt% Li₂O–LiCl, (c) corrosion products in 3 wt% Li₂O–LiCl, and (d) the as-received specimen.

Figure 4. XRD patterns of the surface corrosion layer of CSZ corroded at 650°C for 168 h (a) in 1 wt% Li₂O–LiCl, (b) in 3 wt% Li₂O–LiCl, and (c) the as-received specimen.

Figure 5. Cross-sectional SEM images of mullite corroded at 650°C for 168 h (a) in 1 wt% Li₂O–LiCl and (b) in 3 wt% Li₂O–LiCl and CSZ corroded at 650°C for 168 h (c) in 1 wt% Li₂O–LiCl and (d) in 3 wt% Li₂O–LiCl.

Figure 6. Cross-sectional microstructures and EDS line analysis results of mullite corroded at 650°C for 168 h in (a) 1 wt% Li₂O–LiCl and (b) 3 wt% Li₂O–LiCl.

Figure 7. Cross-sectional microstructures and EDS line analysis results of CSZ corroded at 650°C for 168 h in (a) 1 wt% Li₂O–LiCl and (b) 3 wt% Li₂O–LiCl.

Figure 8. Cross-sectional microstructures and EDS analysis results of mullite corroded at 650°C for 168 h in (a) 1 wt% Li₂O–LiCl and (b) 3 wt% Li₂O–LiCl.

Figure 9. Cross-sectional microstructures and EDS analysis results of CSZ corroded at 650°C for 168 h in (a) 1 wt% Li₂O–LiCl and (b) 3 wt% Li₂O–LiCl.