西洋菜提取液在酸性介质中的缓蚀性能
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摘要
植物缓蚀剂因具有来源广、成本低和可生物降解等优点而受到广泛关注。为促进绿色植物型缓蚀剂的研究应用,以西洋菜为原料,采用酸液浸泡提取制得了天然缓蚀剂。利用失重法、极化曲线、电化学阻抗谱研究了其在3%盐酸溶液中对铁片的缓蚀性能,并对缓蚀分子的吸附和腐蚀动力学过程进行探讨;对西洋菜粉末进行红外光谱分析,推断其可能的缓蚀机理。结果表明:西洋菜提取液对酸性介质中铁片的腐蚀反应有明显抑制作用,缓蚀剂的最佳工艺条件为浸泡时间96 h,温度20～30℃,浓度1 250 mg/L;西洋菜提取液属于混合型缓蚀剂,缓蚀效率随浓度增加而增加,随温度的上升而减小,其缓蚀分子的吸附符合Langmuir等温方程式;西洋菜里含有不饱和有机化合物的极性基团(羧基、羟基、羰基等),可作为酸性缓蚀剂。
Owing to wide resource,low cost and biodegradable property,the plant corrosion inhibitors have attracted extensive attentions. In order to assist the application of green plant corrosion inhibitors,the plant corrosion inhibitor was extracted by using acid soaking watercress as raw material,and the performances of the corrosion inhibitor on steel in 3% HCl solution were investigated by weight-loss method,polarization curves and electrochemical impedance spectrum,respectively. The adsorption of corrosion inhibitor and the corrosion kinetics processes were discussed. Moreover,the inhibitor functional groups were determined by infrared spectrum,and the mechanical corrosion of steel was discussed. Results showed that the extract from watercress possessed an effective inhibiting effect on the corrosion reaction of steel in acid medium,and the optimal conditions of corrosion inhibitor were 96 hours of soaking time,20-30 ℃ of temperature and extract content of 1 250 mg/L. The watercress extract belonged to mixed-type inhibitor, and the inhibition performance was enhanced with the increase of concentration,but weakened with the rise of experiment temperature. Besides,the adsorption of watercress extract molecules followed Langmuir adsorption isotherm. The polar groups( carboxyl,hydroxyl,carbonyl,etc.) of unsaturated organic compounds in watercress could be employed as acidic corrosion inhibitor.
Owing to wide resource,low cost and biodegradable property,the plant corrosion inhibitors have attracted extensive attentions. In order to assist the application of green plant corrosion inhibitors,the plant corrosion inhibitor was extracted by using acid soaking watercress as raw material,and the performances of the corrosion inhibitor on steel in 3% HCl solution were investigated by weight-loss method,polarization curves and electrochemical impedance spectrum,respectively. The adsorption of corrosion inhibitor and the corrosion kinetics processes were discussed. Moreover,the inhibitor functional groups were determined by infrared spectrum,and the mechanical corrosion of steel was discussed. Results showed that the extract from watercress possessed an effective inhibiting effect on the corrosion reaction of steel in acid medium,and the optimal conditions of corrosion inhibitor were 96 hours of soaking time,20-30 ℃ of temperature and extract content of 1 250 mg/L. The watercress extract belonged to mixed-type inhibitor, and the inhibition performance was enhanced with the increase of concentration,but weakened with the rise of experiment temperature. Besides,the adsorption of watercress extract molecules followed Langmuir adsorption isotherm. The polar groups( carboxyl,hydroxyl,carbonyl,etc.) of unsaturated organic compounds in watercress could be employed as acidic corrosion inhibitor.
引文
[1]范洪波.新型缓蚀剂的合成与应用[M].北京:化学工业出版社,2003:1-2.
[2]Radojcˇic'I,Berkovic'K,KovacˇS,et al.Natural honey and black radish juice as tin corrosion inhibitors[J].Corrosion Science,2008,50(5):1 498-1 504.
[2]杨尚军.生物缓蚀剂的研制及其缓蚀机理研究[D].重庆:重庆大学,2006:3-5.
[4]郭稚弧,唐和清.几种植物萃取液对碳钢腐蚀的抑制作用[J].材料保护,1989,22(2):9-12.
[5]林整,大蒜汁对钢在某些介质中的缓蚀作用[J].劳动安全与健康,1998(3):50-51.
[6]陈文,管春平,胡小安.刺五加提取物在盐酸中对钢的缓蚀作用[J].材料保护,2016,49(2):37-41.
[7]刘学虎,辛剑,马伟.海带提取液作为酸洗缓蚀剂的研究[J].腐蚀科学与防护技术,2003,15(3):172-174.
[8]潘美贞,蔡洁,余梅.桉树叶提取物对A3钢在酸性介质中缓蚀性能的研究[J].化学工程师,2010,24(2):70-72.
[9]CHEN W,LUO H Q,LI N B.Inhibition effects of 2,5-dimer-capto-1,3,4-thiadiazole on the corrosion of mild steel in sulphuric acid solution[J].Corrosion Science,2011,53(10):3 356-3 365.
[10]KUMAR S,SHARMA D,YADAV M,et al.Experimental and quantum chemical studies on corrosion inhibition effect of synthesized organic compounds on N80 steel in hydrochloric acid[J].Industrial Engineering Chemistry Research,2013,52(39):14 019-14 029.?翸f
[11]AHAMAD I,QURAISHI M A.Mebendazole:New and efficient corrosion inhibitor for mild steel in acid medium[J].Corrosion Science,2010,52(2):651-656.?
[12]曹楚南.腐蚀电化学原理:第2版[M].北京:化学工业出版社,2004:235-239.
[13]王芸,汤滢谢,长生,等.电化学阻抗谱在材料研究中的应用[J].材料导报,2011(13):5-9.
[14]FARES M M,MAAYTA A K,AL-MUSTAFA J A.Corrosion inhibition of iota-carrageenan natural polymer on aluminum in presence of zwitterion mediator in HCl media[J].Corrosion Science,2012,65(65):223-230.
[15]LI X,DENG S.Inhibition effect of dendrocalamus brandisii,leaves extract on aluminum in HCl,H3PO4solutions[J].Corrosion Science,2012,65(12):299-308.
[16]YURT A,ULUTAS S,DAL H.Electrochemical and theoretical investigation on the corrosion of aluminium in acidic solution containing some Schiff bases[J].Applied Surface Science,2006,253(2):919-925.
[17]BENTISS F,TRAISNEL M,LAGRENEE M.The substituted 1,3,4-oxadiazoles:A new class of corrosion inhibitors of mild steel in acidic media[J].Corrosion Science,2000,42(1):127-146.
[18]张天胜.缓蚀剂[M].北京:化学工业出版社,2002:116-145.
[2]Radojcˇic'I,Berkovic'K,KovacˇS,et al.Natural honey and black radish juice as tin corrosion inhibitors[J].Corrosion Science,2008,50(5):1 498-1 504.
[2]杨尚军.生物缓蚀剂的研制及其缓蚀机理研究[D].重庆:重庆大学,2006:3-5.
[4]郭稚弧,唐和清.几种植物萃取液对碳钢腐蚀的抑制作用[J].材料保护,1989,22(2):9-12.
[5]林整,大蒜汁对钢在某些介质中的缓蚀作用[J].劳动安全与健康,1998(3):50-51.
[6]陈文,管春平,胡小安.刺五加提取物在盐酸中对钢的缓蚀作用[J].材料保护,2016,49(2):37-41.
[7]刘学虎,辛剑,马伟.海带提取液作为酸洗缓蚀剂的研究[J].腐蚀科学与防护技术,2003,15(3):172-174.
[8]潘美贞,蔡洁,余梅.桉树叶提取物对A3钢在酸性介质中缓蚀性能的研究[J].化学工程师,2010,24(2):70-72.
[9]CHEN W,LUO H Q,LI N B.Inhibition effects of 2,5-dimer-capto-1,3,4-thiadiazole on the corrosion of mild steel in sulphuric acid solution[J].Corrosion Science,2011,53(10):3 356-3 365.
[10]KUMAR S,SHARMA D,YADAV M,et al.Experimental and quantum chemical studies on corrosion inhibition effect of synthesized organic compounds on N80 steel in hydrochloric acid[J].Industrial Engineering Chemistry Research,2013,52(39):14 019-14 029.?翸f
[11]AHAMAD I,QURAISHI M A.Mebendazole:New and efficient corrosion inhibitor for mild steel in acid medium[J].Corrosion Science,2010,52(2):651-656.?
[12]曹楚南.腐蚀电化学原理:第2版[M].北京:化学工业出版社,2004:235-239.
[13]王芸,汤滢谢,长生,等.电化学阻抗谱在材料研究中的应用[J].材料导报,2011(13):5-9.
[14]FARES M M,MAAYTA A K,AL-MUSTAFA J A.Corrosion inhibition of iota-carrageenan natural polymer on aluminum in presence of zwitterion mediator in HCl media[J].Corrosion Science,2012,65(65):223-230.
[15]LI X,DENG S.Inhibition effect of dendrocalamus brandisii,leaves extract on aluminum in HCl,H3PO4solutions[J].Corrosion Science,2012,65(12):299-308.
[16]YURT A,ULUTAS S,DAL H.Electrochemical and theoretical investigation on the corrosion of aluminium in acidic solution containing some Schiff bases[J].Applied Surface Science,2006,253(2):919-925.
[17]BENTISS F,TRAISNEL M,LAGRENEE M.The substituted 1,3,4-oxadiazoles:A new class of corrosion inhibitors of mild steel in acidic media[J].Corrosion Science,2000,42(1):127-146.
[18]张天胜.缓蚀剂[M].北京:化学工业出版社,2002:116-145.