Figure 1. Mechanism of high temperature corrosion by alkali chlorides(chlorine-cycle)[14].
Figure 2. Photo of metal coupons.
Figure 3. Procedure of high temperature corrosion experiment.
Figure 4. Variation of weight loss using cleaning method according to ASTM G1-03.
Figure 5. Rate of weight loss with respect to the alkali chlorides and coupons at 400 ℃.
Figure 6. Rate of weight loss with respect to the alkali chlorides and coupons at 500 ℃.
Figure 7. Surface morphology of the T2 coupons: (a) Reference, 400 ℃ (b) KCl, 400 ℃ (c) NaCl, 400 ℃ (d) Reference, 500 ℃ (e) KCl, 500 ℃ (f) NaCl, 500 ℃.
Figure 8. Surface morphology of the T12 coupons: (a) Reference, 400 ℃ (b) KCl, 400 ℃ (c) NaCl, 400 ℃ (d) Reference, 500 ℃ (e) KCl, 500 ℃ (f) NaCl, 500 ℃.
Figure 9. Surface morphology of the T22 coupons: (a) Reference, 400 ℃ (b) KCl, 400 ℃ (c) NaCl, 400 ℃ (d) Reference, 500 ℃ (e) KCl, 500 ℃ (f) NaCl, 500 ℃.
Table 1. Previous studies on anti-corrosion technology as material aspects
Table 2. Characteristic of boiler tubes materials and their applications
Table 3. Chemical composition of coupons
Table 4. SEM photo with respect to temperature and kinds of alkali chlorides
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