Rare earth 4-hydroxycinnamate compounds as carbon dioxide corrosion inhibitors for steel in sodium chloride solution
Rare earth 4-hydroxycinnamate compounds as carbon dioxide corrosion inhibitors for steel in sodium chloride solution
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DOI：
10.1149/2.0231412jes
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发表时间：
2014
影响因子：
3.9
通讯作者：
N. Nam;M. Mathesh;B. Hinton;M. Tan;M. Forsyth
中科院分区：
文献类型：
--
作者：
N. Nam;M. Mathesh;B. Hinton;M. Tan;M. Forsyth
合成了4-羟基肉桂酸稀土化合物Ce（4 OHCin）3、La（4 OHCin）3和Pr（4 OHCin）3，并评价了它们作为CO2饱和NaCl溶液中CO2缓蚀剂的性能。电化学测量和表面分析表明，这些REM（4 OHCin）3化合物有效地抑制CO2腐蚀形成保护性抑制沉积物，关闭活性电化学腐蚀网站的钢表面。结果表明，随着缓蚀剂浓度的增加，其缓蚀效率的增加顺序为Ce（4 OHCin）_3 < La（4 OHCin）_3 < Pr（4 OHCin）_3，缓蚀剂浓度最高可达0.63mM。钢在含二氧化碳（CO2）水介质中的电化学腐蚀是一个严重的问题，发生在主要工业基础设施中，例如碳捕获、传输和储存设施1、2以及油气威尔斯和管道3，其中钢是最广泛使用的材料。二氧化碳可以以固体、液体、蒸气或超临界流体相存在，其中冷凝相是最容易在管道中运输的。在石油和天然气生产中，CO2是与水相3相关的天然存在的组分，并且甚至可以作为第二次强化采油过程的一部分有意添加。4在水环境中，CO2溶解并形成碳酸（H2 CO 3），导致各种形式的钢铁腐蚀。众所周知，含CO2溶液的腐蚀性明显高于正常的弱酸溶液，并且在给定的pH值下，含CO2水溶液对钢的腐蚀性大于盐酸。4，5腐蚀抑制是目前石油和天然气生产工业中最广泛使用的腐蚀控制方法。在过去的二十年里，在理解这一现象方面取得了重大进展，6-9然而，通常缺乏对重要的CO2腐蚀抑制剂的行为和机制的全面理解。10
A series of rare earth 4-hydroxycinnamate compounds including Ce(4OHCin)3, La(4OHCin)3, and Pr(4OHCin)3 has been syn- thesized and evaluated as novel inhibitors for carbon dioxide corrosion of steel in CO2-saturated sodium chloride solutions. Electrochemical measurements and surface analysis have shown that these REM(4OHCin)3 compounds effectively inhibited CO2 corrosion by forming protective inhibiting deposits that shut down the active electrochemical corrosion sites on the steel surface. Inhibition efficiency was found to increase in the order Ce(4OHCin)3 < La(4OHCin)3 < Pr(4OHCin)3 and with increase in in- hibitor concentration up to 0.63 mM. Detailed insights into corrosion inhibition mechanism of these compounds in carbon dioxide environment are also provided. Electrochemical corrosion of steel in carbon dioxide (CO2) con- taining aqueous media is a serious problem that occurs in major in- dustrial infrastructure such as carbon capture, transmission and se- questration facilities 1,2 and oil and gas wells and pipelines, 3 where steel is the most widely used material. Carbon dioxide can exist as a solid, liquid, vapor or supercritical fluid phase, with the condensed phase being the simplest to transport in pipelines. In the oil and gas production, CO2 is a naturally-occurring component associated with the water phase 3 and may even be intentionally added as part of sec- ondaryenhanced oil-recoveryprocesses.Inthepresenceoffreewater, CO2 can cause severe corrosion problems, commonly referred to as CO2 corrosion. 4 In aqueous environments, CO2 dissolves and forms carbonic acid (H2CO3), leading to various forms of steel corrosion. It is well known that a CO2-containing solution is significantly more corrosive than normal weak acid solutions, and that, at a given pH, more corrosion of steel is caused by an aqueous CO2-containing so- lution than by hydrochloric acid. 4,5 Corrosion inhibition is currently the most widely used method for corrosion control in the oil and gas production industry. Significant progress has been achieved over the past two decades in understanding this phenomenon, 6-9 however a comprehensive understanding of the behaviours and mechanisms of important CO2 corrosion inhibitors is often lacking. 10