The role of chloride ions in pitting of carbon steel studied by the statistical analysis of electrochemical noise

Cheng, Y. Frank; Wilmott, M.; Luo, Jing‐Li

doi:10.1016/s0169-4332(99)00328-1

Cited by 113 publications

(61 citation statements)

References 33 publications

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“…In the absence of MDMAE, a very rough and totally uneven surface is observed in Fig. 9b and a large number of macro pits and badly corroded topography of the mild steel coupons are visible as a result of the corrosive actions of chloride and sulphate ions 23,24 in Fig. 9b, indicating the actions of these ions in the facial corrosion of the steel.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Loto

Popoola

2015

S.Afr.j.chem

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The influence of deanol on the corrosion behaviour of mild steel in dilute sulphuric acid with sodium chloride addition was studied by means of mass-loss, potentiodynamic polarization, electrode potential monitoring, scanning electron microscopy and statistical analysis. Results show that deanol performed excellently with a maximum inhibition efficiency of 97.9 % obtained from the mass loss technique and 98.23 % from the potentiodynamic polarization tests at the maximum deanol concentration evaluated. Polarization studies show that the amino alcohol is a cathodic type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin adsorption isotherms. Scanning electron microscopy studies confirmed the corrosion protection property of deanol to be through adsorption on the mild steel surface while statistical evaluation showed the overwhelming influence and significance of inhibitor concentration on inhibition efficiency compared with exposure time. KEYWORDSOrganic compounds, metals, deanol, corrosion, sulphuric acid, inhibitor IntroductionMild steel has excellent mechanical properties. Its low cost allows for extensive use as the material of construction in petroleum industries, chemical processing plants, marine applications, boilers, refinery plants, extractive industries, etc. However, its application under these industrial conditions subjects it to rapid corrosion attack especially in applications involving the extensive use of sulfuric acid and other corrosive media due to their wide range of applications, including domestic acidic drain cleaner, electrolyte in lead-acid batteries and various cleaning agents.1 The most cost-effective and practical corrosion control technique for effectively preventing the occurrence or reducing the severity of corrosion is to alter the electrochemical nature of the environment with chemical compounds known as inhibitors.2,3 Effective corrosion inhibition is subject to the chemical composition, molecular structure and affinity of the inhibiting compound with the metallic alloy surface. Deanol has been used for corrosion prevention in concrete with mixed results. [4][5][6][7] The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface. This provides an impenetrable barrier to metal dissolution that acts to stifle cathodic and or anodic electrochemical corrosion reactions taking place at the metal/solution interface. This investigation aims to evaluate the corrosion inhibition properties of deanol on the electrochemical behaviour of mild steel in aqueous dilute sulphuric acid at ambient temperature of 25 °C.

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Loto

Popoola

2015

S.Afr.j.chem

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“…the shape and the frequency of occurrence of current and potential transients is considered to be an indication of corrosion pit formation and its repassivation/propagation [9,68]. These transients of potential and current are not normally found in noise data obtained from coated metal.…”

Section: Time Domain Data Analysismentioning

confidence: 99%

“…[5,6], showing how Rn is a measure of corrosion resistance. Also mechanistic information about the corrosion process of a bare (uncoated) metal has been acquired through analysis of electrochemical noise data using statistical methods [7][8][9]. Note that in this kind of work, special care must be taken in normalizing the Rn per unit of exposed surface area as this is required for the calculation of an absolute corrosion rate [10,11].…”

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confidence: 99%

A critical review of electrochemical noise measurement as a tool for evaluation of organic coatings

Jamali

Mills

2016

Progress in Organic Coatings

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The simplicity of measuring equipment and versatility of data analysis makes electrochemical noise measurement an ideal technique for acquiring electrochemical information about the corrosion behavior of a painted metal relatively quickly. Hence the method has great potential for use in the laboratory as well as in field situations. However, special care must be taken in choosing data acquisition parameters, reference electrodes and symmetry of electrodes in order to achieve reproducible measurements. These areas have been discussed in this review along with methods of data analysis, alternative electrode configurations for on-site measurements and novel applications of the technique. AbstractThe simplicity of measuring equipment and versatility of data analysis makes electrochemical

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“…Migration of Cl -onto active sites sustains pitting. Initiation and propagation of pits has received much attention [6,7,[11][12][13][14][15][16][17][18], as has pitting inhibition by inhibitors [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Effect of H 3 BO 3 on corrosion in 0.01 M NaCl solution of the interface between low alloy steel A508 and alloy 52 M

et al. 2016

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Effect of H3BO3 on corrosion in 0.01M NaCl solution of the interface between low alloy steel A508 and alloy 52M, Corrosion Science http://dx.doi.org/10.1016/j.corsci. 2015.10.040 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 3. Element B is enriched in the pit after adding H 3 BO 3 in NaCl solution. 32 AbstractThe corrosion of the low alloy steel A508-alloy 52M interface region in buffered and non-buffered chloride containing solutions was studied by using the scanning vibrating electrode technique (SVET), scanning ion-selective electrode technique (SIET), and time of flight secondary ion mass spectroscopy (ToF-SIMS). The typical pit in low alloy steel A508 formed in NaCl solution was stopped immediately when H 3 BO 3 was added to the NaCl solution, and the pit became cathodic.With increasing immersion time, H 3 BO 3 entered into the pit, and the corrosion of A508 became general corrosion.

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The role of chloride ions in pitting of carbon steel studied by the statistical analysis of electrochemical noise

Cited by 113 publications

References 33 publications

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

A critical review of electrochemical noise measurement as a tool for evaluation of organic coatings

Effect of H 3 BO 3 on corrosion in 0.01 M NaCl solution of the interface between low alloy steel A508 and alloy 52 M

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