王霞,蒋欢,侯丽,周雯洁,王辉,任帅飞.Fe3+对双曼尼希碱（DM）缓蚀性能及吸附行为的影响[J].表面技术,2018,47(6):24-30.
WANG Xia,JIANG Huan,HOU Li,ZHOU Wen-jie,WANG Hui,REN Shuai-fei.Effects of Fe3+ on Corrosion Inhibition and Adsorption Behavior of Double Mannich Bases (DM)[J].Surface Technology,2018,47(6):24-30 |
| Fe3+对双曼尼希碱（DM）缓蚀性能及吸附行为的影响 |
| Effects of Fe3+ on Corrosion Inhibition and Adsorption Behavior of Double Mannich Bases (DM) |
| 投稿时间：2017-12-27 修订日期：2018-06-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.06.004 |
| 中文关键词: 曼尼希碱 吸附作用 电化学 热力学 动力学 |
| 英文关键词:Mannich bases adsorption electrochemistry thermodynamics dynamics |
| 基金项目:国家自然科学基金面上项目（51174171） |
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| Author | Institution |
| WANG Xia | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
| JIANG Huan | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
| HOU Li | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
| ZHOU Wen-jie | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
| WANG Hui | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
| REN Shuai-fei | School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China |
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| 中文摘要: |
| 目的 针对曼尼希碱类缓蚀剂使用工况恶劣、影响因素复杂的情况，以单曼尼希碱为中间体，合成双曼尼希碱缓蚀剂（DM）。方法 采用失重法、电化学方法研究Fe3+对DM缓蚀性能的影响，计算DM在N80钢片表面的吸附热力学与动力学，并探讨Fe3+对DM吸附行为的影响。结果 在60 ℃、腐蚀介质总体积250 mL、缓蚀剂（DM）质量分数1%、盐酸质量分数20%、浸泡时间4 h的条件下，当Fe3+质量浓度小于900 mg/L时，其腐蚀速率小于4 g/(m2•h)，满足SY/T 5405—1996对盐酸酸化缓蚀剂一级品的评价指标；当Fe3+质量浓度大于900 mg/L时，其腐蚀速率仍然小于5 g/(m2•h)，满足盐酸酸化缓蚀剂二级品的评价指标。在1%DM的缓蚀溶液中，ΔGads=－44.86 kJ/mol，当溶液中存在Fe3+时，ΔGads=－42.56 kJ/mol，与未加Fe3+的相比，ΔGads更趋向于－40 kJ/mol。N80钢在20%盐酸溶液中的Ea值为7.10 kJ/mol，加入1%DM和1%DM+600 mg/L Fe3+时的Ea值分别为25.45、23.90 kJ/mol。加入1%DM时，ΔEcorr=50 mV；加入1%DM+600 mg/L Fe3+时，ΔEcorr=30 mV。结论 N80钢在60 ℃、20%HCl条件下，DM缓蚀效率高达99.8%，是一种混合型缓蚀剂。在N80钢表面的吸附为混合型吸附，且吸附过程是一个自发、放热的过程，吸附规律服从Langrauir吸附等温式。加入Fe3+后，对DM缓蚀性能起抑制作用，Fe3+并没有改变DM的缓蚀剂类型，且Fe3+通过破坏DM在N80钢表面的化学吸附来降低其缓蚀效率。 |
| 英文摘要: |
| In view of poor service conditions and complicated influence factors of Mannich alkali corrosion inhibitor, the work aims to synthesize the double Mannich base inhibitor (DM) with single Mannich base as intermediate. The influence of Fe3+ on corrosion inhibition of DM was studied in weight loss method and electrochemical method. Adsorption thermodynamics and dynamics of DM on the surface of N80 steel sheet were calculated, and the effects of Fe3+ on adsorption behavior of DM were discussed. Provided with following parameters: temperature as 60 ℃, total volume of corrosive medium as 250 mL, mass fraction of corrosion inhibitor (DM) as 1%, mass fraction of hydrochloric acid as 20% and soaking duration as 4 h, evaluation index for first-grade hydrochloric acid acidizing corrosion inhibitors was met when mass concentration of Fe3+ was less than 900 mg/L and corrosion rate was less than 4 g/(m2•h); and evaluation index for second-grade hydrochloric acid acidizing corrosion inhibitors was met when mass concentration of Fe3+ was more than 900 mg/L and corrosion rate was less than 5 g/(m2•h). ΔGads was －44.86 kJ/mol in 1% DM corrosion inhibition solution, ΔGads was －42.56 kJ/mol when the solution contained Fe3+, and it tended to be －40 kJ/mol compared with solution without Fe3+. Ea value of N80 steel in 20% hydrochloric acid solution was 7.10 kJ/mol, Ea value was 25.45, 23.90 kJ/mol, respectively when 1% DM and 1% DM+600 mg/L Fe3+ was added. ΔEcorr was 50 mV when 1% DM was added, and 30 mV when 1% DM+600 mg/L Fe3+ was added. DM corrosion inhibition efficiency of N80 steel is up to 99.8% in 20% HCl at 60 ℃. The adsorption of DM on N80 steel surface is mixed type adsorption, the adsorption process is spontaneous and exothermic, and adsorption law follows the Langrauir adsorption isotherm. Fe3+ can reduce corrosion inhibition efficiency of DM, but it does not change the type of inhibitor, and it reduces corrosion inhibition efficiency of Fe3+ by destroying chemical adsorption of DM on N80 steel surface. |
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