20~#无缝钢管在液态CO_2中的腐蚀规律研究

利用电化学工作站和低温高压釜系统对20~#无缝钢管在液态二氧化碳条件下的腐蚀行为进行研究,分析了20~#钢在液态CO_2下浸泡168h后的腐蚀规律,随压力升高、温度降低,腐蚀程度均呈现加重的趋势,H_2S会加重20~#的腐蚀程度,N_2、O_2则会减缓20~#的腐蚀。

16Mn钢在液态CO_2中的腐蚀规律研究

利用电化学工作站和低温高压釜系统对16Mn钢在液态二氧化碳条件下的腐蚀行为进行研究,分析了16Mn钢在液态CO_2下浸泡168h后的腐蚀规律,随压力升高、温度降低,腐蚀程度均呈现加重的趋势,抗拉强度变化不大,而屈服强度则显著增大,材料发生脆性断裂的趋势增大;H_2S会大大加重16Mn钢的腐蚀程度,N_2、O_2存在的情况下腐蚀相对较轻。

Electrochemical tests on zincating solution with zinc sulfate and zinc oxide

In order to find out a multi-metal zincate solution to get good micromorphology and fine adhesion of coatings, sulfate zincate and zinc oxide zincate with different chelating agents combinations, of which there are 8 solutions are designed. CHI630 electrochemical test system is applied to measure the φ—t curves of zincate process and Tafle curves of zincated plates in 3.5% NaCl medium. The analyzed results show that when molar ratio of sodium hydroxide to zinc ions is constant, the better chelating agents combination for multi-metal zincation solution is the combination of sodium potassium tartrate and sodium citrate in zinc oxide solution, from which zinc alloy is high in potential and perfect in corrosion resistance. After the second zincate immersion for 60s, the immersion potential is -1.606V(vs SCE). The corrosion current density is 6.612, J_ corr/(A·cm -2); and the corrosion potential is -1.381, φ_ corr(I=0)/V.

316L不锈钢在液态CO2下的腐蚀行为研究

利用电化学工作站和低温高压釜对316L不锈钢在液态CO 2条件下的腐蚀行为进行研究,测得了不同温度、压力条件下的Tafel曲线和Nyquist谱图,表明316L不锈钢在液态CO 2浸泡168h后均出现了轻微的腐蚀现象;随压力升高、温度降低,腐蚀程度均呈现加重的趋势,抗拉强度变化不大;含O 2杂质情况下会大大减轻316L不锈钢的腐蚀程度。