ABSTRACT
The fast development of the waste incineration industry requires deeper insights into heating surface corrosion behavior at higher operating parameters with complex corrosion sources. This research investigates the corrosion behaviors of three types of plates, namely SA210-C, TP310, and 12CrMoV, when subjected to simulated flue gas and fly ash deposition simultaneously at temperatures ranging from 500â to 620â. The results indicate that the weight loss due to coupling corrosion was 2.5 to 84.5 times higher than that of gas-phase corrosion under the same operating conditions. Among the three stainless-steels, TP310 demonstrates superior corrosion resistance. It is worth noting that, under the gas-solid coupling corrosion conditions, we observed a distinct two-layer structure of corrosion products. Despite the fly ash simulants detaching over time, the two-layer structure remained unchanged. Based on the theory of eutectic molten salt formation, we propose that alkali metal chlorides only initiate the formation of the molten layer in the initial stage of corrosion. Furthermore, we offer additional suggestions for the mechanism of sustaining the molten layer in the absence of alkali metal chlorides.
ABSTRACT
OBJECTIVE: To explore the clinical efficacy of endovascular treatment for lower extremity arteriosclerosis obliterans. METHODS: A total of 34 patients (43 limbs) with lower extremity arteriosclerosis obliterans undergoing endovascular treatment from July 2010 to July 2012 were analyzed. The cohort had Fontaine stage II b (n = 16), Fontaine stage III (n = 10) and Fontaine stage III (n = 8). Among them, the lesions were of TASC IIA (n = 4), TASC IIB (n = 8), TASC IIC (n = 9) and TASC IID (n = 13). All patients underwent percutaneous transluminal angioplasty (PTA) plus stents after computed tomographic angiography (CTA) or digital subtraction angiography (DSA). And 9 patients underwent femoral endarterectomy associated with endovascular treatment. RESULTS: The success rate of this technique was 100%. One iliac artery ruptured during endovascular surgery. One patient suffered intraoperatively from arterial perforation. One patient was amputated one week later. One patient had in-stent thrombosis at Week 3 post-treatment. One patient was amputated at Week 4 after endovascular treatment. Thirty patients (38 limbs) were followed up for 13.3 months. During the follow-up, 3, 4 and 4 limbs became occluded at Month 6, 12 and 24 post-treatment respectively. CONCLUSION: Endovascular treatment has an excellent early patency rate. Special issues should be properly handled during endovascular treatment.
