Effect of nitrate ion on corrosion inhibition of mild steel in simulated cooling water

Chemical Engineering Research Bulletin Pub Date : 2010-08-28 DOI:10.3329/CERB.V14I2.4813

S. Karim, C. M. Mustafa, M. Assaduzzaman, Mayeedul Islam

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引用次数: 27

Abstract

Corrosion inhibition of mild steel by sodium nitrite in simulated cooling water (SCW) containing chloride ion was investigated. Electrochemical techniques such as corrosion potential (E corr ) measurement and potentiodynamic sweep experiments were used. The experimental parameters were concentration of the inhibitor, pH of the aqueous media and soaking time. Nitrite inhibited mild steel corrosion in near neutral and alkaline (pH 6 and above) SCW and accelerated corrosion in acidic media (pH 4 and below). Inhibition activity increased with the increase of nitrite concentration up to 500 ppm, and afterwards remained more or less constant at pH 6 and above. In stagnant SCW, maximum corrosion inhibition was observed at pH 8 for all concentration of NaNO 2 . Inhibition action of NaNO 2 was found to increase with the increase of soaking time up to 24 hours, and afterwards it remained more or less constant at all nitrite concentrations at and above pH 6. Based on the experimental results, mechanisms of action of NaNO 2 on mild steel corrosion inhibition in SCW have been proposed. Keywords: Corrosion; Potentiodynamic sweep; Inhibitor DOI = 10.3329/cerb.v14i2.4813 Chemical Engineering Research Bulletin 14 (2010) 87-91

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硝酸根离子对模拟冷却水中低碳钢缓蚀性能的影响

研究了亚硝酸钠在含氯离子模拟冷却水中的缓蚀作用。电化学技术如腐蚀电位(E - corr)测量和动电位扫描实验。实验参数为缓蚀剂浓度、水介质pH和浸泡时间。亚硝酸盐在接近中性和碱性(pH 6及以上)SCW中抑制低碳钢的腐蚀，在酸性(pH 4及以下)介质中加速腐蚀。抑制活性随亚硝酸盐浓度的增加而增加，直至500ppm，此后在pH 6及以上时基本保持不变。在停滞的SCW中，在pH为8时，所有浓度的纳米2都有最大的缓蚀作用。纳米2的抑制作用随着浸泡时间的增加而增加，直至24小时，之后在pH为6及以上的所有亚硝酸盐浓度下，其抑制作用基本保持不变。根据实验结果，提出了纳米2在水淬中对低碳钢的缓蚀作用机理。关键词:腐蚀;Potentiodynamic扫描;抑制剂DOI = 10.3329/cerb.v14i2.4813化学工程研究通报14 (2010)87-91

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Chemical Engineering Research Bulletin

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