A Fresh Look at ASTM G 1-90 Solution Recommended for Cleaning of Corrosion Products Formed on Iron and Steels

Singh, D D N; Kumar, Ankit

doi:10.5006/1.3277521

Cited by 25 publications

(11 citation statements)

References 18 publications

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“…Pits were identified after carefully selecting the thresholds with distinct pit depths, diameters and areas being quantified. The corrosion products were removed by rubbing them with Clarke solution 39 then rinsing with acetone and drying.…”

Section: Electrochemical Testsmentioning

confidence: 99%

Siderite micro-modification for enhanced corrosion protection

et al. 2017

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Production of oil and gas results in the creation of carbon dioxide (CO2) which when wet is extremely corrosive owing to the speciation of carbonic acid. Severe production losses and safety incidents occur when carbon steel (CS) is used as a pipeline material if corrosion is not properly managed. Currently corrosion inhibitor (CI) chemicals are used to ensure that the material degradation rates are properly controlled; this imposes operational constraints, costs of deployment and environmental issues. In specific conditions, a naturally growing corrosion product known as siderite or iron carbonate (FeCO3) precipitates onto the internal pipe wall providing protection from electrochemical degradation. Many parameters influence the thermodynamics of FeCO3 precipitation which is generally favoured at high values of temperatures, pressure and pH. In this paper, a new approach for corrosion management is presented; micro-modifying the corrosion product. This novel mitigation approach relies on enhancing the crystallisation of FeCO3 and improving its density, protectiveness and mechanical properties. The addition of a silicon-rich nanofiller is shown to augment the growth of FeCO3 at lower pH and temperature without affecting the bulk pH. The hybrid FeCO3 exhibits superior general and localised corrosion properties. The findings herein indicate that it is possible to locally alter the environment in the vicinity of the corroding steel in order to grow a dense and therefore protective FeCO3 film via the incorporation of hybrid organic-inorganic silsesquioxane moieties. The durability and mechanical integrity of the film is also significantly improved.

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Section: Electrochemical Testsmentioning

confidence: 99%

Siderite micro-modification for enhanced corrosion protection

et al. 2017

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“…It can be expected that this method gives better results than descaling analysis based on optical inspection with naked eye. Singh et al 21 reported that a weak point of weight loss determinations described by-ASTM G1-90 20 is that different types of steel show different rates of acid corrosion in the Sb 2 O 3 inhibited solution. Since in our work all measurements were performed with the same steel, errors are expected to have the same effect on connected and on unconnected samples.…”

Section: Resultsmentioning

confidence: 99%

“…Clark solution according to ASTM G1-90 consists of HCl, Sb 2 O 3 and SnCl 2 . Singh et al 21 describe the function of its ingredients as follows: Sb 2 O 3 acts as inhibitor for acid corrosion of steel and has an efficiency of 98%. Oxides are dissolved by HCl, according to:…”

Section: Methodsmentioning

confidence: 99%

Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers

et al. 2014

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Soil corrosion of carbon steel samples buried up to hundred days close to a high voltage power transmission line tower was examined by weight loss vs. time. A higher weight loss was observed if the samples were electrically connected to the tower than if they were not. This was attributed to the influence of alternating current (AC) signals induced in the soil by the transmission line. This field study showed for the first time the influence of the AC power line on the buried structure of the tower, while other studies so far were focused only on AC corrosion of cathodically protected coated pipelines, running parallel to the transmission line. An improved method was used to measure weight loss by descaling in Clark solution. The new method substitutes discontinuous measurements, proposed in the ASTM-G1-90 standard, by in situ measurements of the weight loss during descaling, using a computer controlled microbalance.

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“…All tests were performed in this solution blended with 1% Chloride ions added as sodium chloride. The other details about the test procedures and equipment are given in our recent publications [7,[15][16][17][18][19][20]. Raman spectroscopy of the coating and corrosion products collected from the test samples was performed by using Almega Dispersive Raman Spectroscope by exciting the laser beam of He-Ne of 532 nm wavelength on the samples.…”

Section: Methodsmentioning

confidence: 99%