中性洗煤环境钢结构高效缓蚀剂的缓蚀性能研究
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摘要
针对洗煤环境中碳钢腐蚀问题,研究了模拟中性洗煤水环境下五元复配缓蚀剂对45~#钢的缓蚀性能。结果表明,五元复配缓蚀剂最佳组合为:钨酸钠40 mg/L、葡萄糖酸钙140 mg/L、硫酸锌120 mg/L、苯骈三氮唑60 mg/L、聚天冬氨酸100 mg/L,该条件下缓释率为96.01%。XRD测试显示,45~#碳钢在模拟洗煤水的腐蚀产物主要成分为Fe_3O_4与FeO(OH);电化学测试表明,缓蚀剂为混合型缓蚀剂;通过金相显微镜检测发现,未加缓蚀剂的碳钢表面腐蚀严重,而添加缓蚀剂的碳钢表面较平整,碳钢表面腐蚀程度明显下降;缓蚀剂在45~#碳钢表面的吸附符合Langmuir吸附模型,复配缓蚀剂的吸附行为是自发的,且是包含物理吸附和化学吸附的混合吸附。
In view of the carbon steel corrosion in coal washing operation, the corrosion inhibition performance of the five-element composite corrosion inhibitor in the simulated neutral coal washing water for 45~# carbon steel was studied by an orthogonal test. The results showed that with the following optimal proportioning, including 40 mg/L sodium tungstate, 140 mg/L calcium gluconate, 120 mg/L zinc sulfate, 60 mg/L benzotriazole, 100 mg/L polyaspartic acid, the sustained release rate was 96.01%. XRD tests showed that the main components of corrosion products of 45~# carbon steel in the simulated coal washing water were Fe_3O_4 and FeO(OH). Electrochemical tests showed that the corrosion inhibitor was a mixed type corrosion inhibitor. The observations by metallographic microscopy showed that corrosion on the surface of carbon steel without inhibitor was serious, while the relatively smooth surface was observed for the carbon steel after adding corrosion inhibitor, indicating a significant inhibitory effect on the corrosion of carbon steel. It is concluded that the adsorption of corrosion inhibitor on the surface of 45~# carbon steel conforms to the Langmuir adsorption model, and the corrosion inhibitor presents a spontaneous adsorption, including physical adsorption and chemical adsorption.
In view of the carbon steel corrosion in coal washing operation, the corrosion inhibition performance of the five-element composite corrosion inhibitor in the simulated neutral coal washing water for 45~# carbon steel was studied by an orthogonal test. The results showed that with the following optimal proportioning, including 40 mg/L sodium tungstate, 140 mg/L calcium gluconate, 120 mg/L zinc sulfate, 60 mg/L benzotriazole, 100 mg/L polyaspartic acid, the sustained release rate was 96.01%. XRD tests showed that the main components of corrosion products of 45~# carbon steel in the simulated coal washing water were Fe_3O_4 and FeO(OH). Electrochemical tests showed that the corrosion inhibitor was a mixed type corrosion inhibitor. The observations by metallographic microscopy showed that corrosion on the surface of carbon steel without inhibitor was serious, while the relatively smooth surface was observed for the carbon steel after adding corrosion inhibitor, indicating a significant inhibitory effect on the corrosion of carbon steel. It is concluded that the adsorption of corrosion inhibitor on the surface of 45~# carbon steel conforms to the Langmuir adsorption model, and the corrosion inhibitor presents a spontaneous adsorption, including physical adsorption and chemical adsorption.
引文
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[3] Waanders F B,Vorster S W.The effect of sulphide and moisture content on steel corrosion during transport of fine wet coal[J].Hyperfine Interactions,2013,218(1-3):29-34.
[4] Zhang Q,Xie J,Zhao W,et al.Effect of coal slurry on the corrosion of coal-mine equipment[J].International Journal of Mining Science and Technology,2011,21(3):413-417.
[5] 符福存.选煤厂钢结构腐蚀特点及防治[J].煤炭加工与综合利用,2010(2):22-24.
[6] 纪少南,欧雪梅,华建锋.浅谈洗选设备的腐蚀研究及防腐保护[J].矿山机械,2012,40(7):9-13.
[7] Ismail A,Ahmad Fuad M F.Effect of Immersion and Green Inhibitor to Corrosion Rate of Carbon Steel[J].Advanced Materials Research,2014,1087:276-281.
[8] 万红敬,王晓梅,黄红军,等.缓蚀剂作用机理研究进展[J].材料保护,2013,46(S1):112-114.
[9] Gao Y B,Hu J,Zuo J,et al.Synergistic Inhibition Effect of Sodium Tungstate and Hexamethylene Tetramine on Reinforcing Steel Corrosion[J].Journal of the Electrochemical Society,2015,162(10):C555-C562.
[10] Siragul Karim,Chand Mohammad Mustafa,Asaduzzaman Md,et al.Corrosion Inhibition of Mild Steel by Calcium Gluconate in Simulated Cooling Water[J].Leonardo Electronic Journal of Practices and Technologies,2010,9(16):167-176.
[11] 谭娜.中锰奥氏体钢矿井水工况的摩擦及腐蚀行为研究[D].徐州:中国矿业大学材料科学与工程学院,2017.
[12] 王克诚,刘欣,王丽红,等.聚天冬氨酸及其与葡萄糖酸钠复配物对碳钢的缓蚀性能研究[J].材料保护,2007(6):60-62.
[13] Zeino A,Abdulazeez I,Khaled M,et al.Mechanistic study of polyaspartic acid (PASP) as eco-friendly corrosion inhibitor on mild steel in 3% NaCl aerated solution[J].Journal of Molecular Liquids,2018,250:50-62.
[14] 孟亚鸽,刘志红,韩正伟,等.硫酸介质中缓蚀剂对碳钢腐蚀和缓蚀性能的研究[J].矿冶工程,2017,37(6):125-130.
[15] Hou B.Inhibition of CTAB on the Corrosion of Mild Steel in Hydrochloric Acid[J].Journal of Dispersion Science & Technology,2011,32(5):672-676.