ent, the size distribution and the micro structure of TiO2 on the cross section of Nafion membrane were discussed. Result s show that the quantity of Ti(OBu)4 and TiO2 in Nafion depends on the soaking solvent. A corre...ent, the size distribution and the micro structure of TiO2 on the cross section of Nafion membrane were discussed. Result s show that the quantity of Ti(OBu)4 and TiO2 in Nafion depends on the soaking solvent. A correlation between the water content in Nafion and the quantity of T iO2 formed was observed. However, the morphologies and the grain size distributi on of nanocrystalline TiO2 in Nafion was not influenced by the water content in Nafion. EDAX analysis indicated that the line and surface distribution of every element content on the cross section of展开更多
文摘ent, the size distribution and the micro structure of TiO2 on the cross section of Nafion membrane were discussed. Result s show that the quantity of Ti(OBu)4 and TiO2 in Nafion depends on the soaking solvent. A correlation between the water content in Nafion and the quantity of T iO2 formed was observed. However, the morphologies and the grain size distributi on of nanocrystalline TiO2 in Nafion was not influenced by the water content in Nafion. EDAX analysis indicated that the line and surface distribution of every element content on the cross section of
文摘在模拟近中性p H土壤腐蚀环境的NS4溶液中,采用慢应变速率拉伸(SSRT)试验、电化学极化和SEM观察,研究了外加阴极极化电位对X80管线钢近中性p H土壤应力腐蚀开裂(SCC)行为的影响。结果表明:X80管线钢在近中性p H土壤环境中SCC敏感性较高,开裂模式为穿晶SCC;SCC机制随外加阴极极化电位不同而改变,外加阴极极化电位高于-900 m V时,SCC受阳极溶解和氢脆混合控制,外加阴极极化电位低于-900 m V时,SCC为氢脆控制;随着外加电位负向增加,慢拉伸试样的断面收缩率、延伸率和断裂时间降低,SCC敏感性增加,在实际管道阴极保护工程中要避免过保护。
