Synthesis and Characterization of Some Thiadiazole Compounds as New Corrosion Inhibitors for Mild Steel in Cooling Water
作者:Ekhlas Qanber Jasim、M.A. Munther Abduljaleel、Rajaa Hussein Fayadh
DOI:10.14233/ajchem.2017.20658
日期:——
In present work, five 1,3,4-thiadiazole compounds were synthesized. The prepared compounds were identified by CHNS analysis, FT-IR and 1H NMR spectroscopy. The corrosion rates in the presence of thiadiazole as a steel corrosion inhibitor in the cooling water system which taken from South Fertilizer Company, Basra, Iraq were measured by the weight loss method and potentiodynamic polarization measurements. The weight loss method was studied in different times (1-5 h) and in 303 to 333 K temperature range. Results obtained revealed that thiadiazole compounds performed as a corrosion inhibitor for mild steel in this medium and its efficiency attains to 86.55 % at 5 × 10-3 M at 303 K and by potentiodynamic polarization measurements its efficiency attains to 85.35 % in the same conditions. The apparent activation energies, enthalpies and entropies of the dissolution process and the free energies were determined and discussed.
本研究合成了五个 1,3,4-噻二唑化合物。所制备的化合物通过 CHNS 分析、傅立叶变换红外光谱和 1H NMR 光谱进行了鉴定。采用失重法和电位极化测量法测量了噻二唑作为钢材缓蚀剂存在时伊拉克巴士拉南部化肥公司冷却水系统的腐蚀速率。失重法在不同的时间(1-5 小时)和 303 至 333 K 的温度范围内进行了研究。结果表明,噻二唑化合物在这种介质中可作为低碳钢的缓蚀剂,当 5 × 10-3 M 的噻二唑化合物在 303 K 时,其效率达到 86.55%;通过电位极化测量,在相同条件下,其效率达到 85.35%。测定并讨论了溶解过程的表观活化能、焓和熵以及自由能。