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Inhibition Effect Of Phenylamine On The Corrosion Of Austenitic Stainless Steel (Type 304) In Dilute Sulphuric Acid
Authors: R.T. Loto, C. A. Loto and A.P.I. Popoola
The corrosion of austenitic stainless steel (type 304) in dilute sulphuric acid solutions in addition to recrystalized sodium chloride concentrates in the presence of specific proportions of phenylamine was studied with the aid of polarization resistance technique, electrode potential monitoring and coupon method. Results showed the overwhelming influence of the compound in corrosion inhibition with an inhibition efficiency of 97.5% from coupon analysis and 86.10% from polarization test at highest observed concentration of the inhibitor.
Authors: Lin Zhaoa, Bowen Li, Lin Linb, Ji Li
N80 steel has been widely applied in the petrochemical enterprises due to its cheap and resistance to corrosion. However, N80 steel is also vulnerable to the erosion caused by chloride ions, a representative of halogen ions, and as the result of chloride erosion, the seriously localized corrosion is induced, such as pitting corrosion, crevice corrosion, stress corrosion cracks, and so forth, exerting severe impact on equipment safety . So far, electrochemical noise (EN) technique has been a well-developed measure for monitoring the corrosion behavior of various environmental conditions because of its outstanding advantage of non-intrusiveness [2-5].
Authors: I. Ryakhovskikh, R. Bogdanov, T. Esiev, A. Marshakov
Initiation and propagation of near-neutral pH SCC was determined using X70 steel specimens. A mixture of NS4 solution with a borate buffer (pH 7.0) were used as background solutions. The tests of specimens were carried out under cyclic loading. Based on the data obtained in this study, the crack initiation occurred at local corrosion defects of steel surface such as corrosion pits.
A Corrosion Study On An Advanced Degradable Alloy For Multi-Stage Fracturing And A Comparison Of Two Measurement Methods
Authors: T. R. Ayers, M. Marya, C. Wang, T. Dunne, V. Singh
An advanced oilfield Al-Mg-X degradable alloy for multi-stage fracturing applications has been tested in both a 15% HC1 acid solution and a 3% KC1 brine (pH 6.5) to evaluate its corrosion or degradation over time through its hydrogen by-product. The potential advantage of this method over traditional ASTM G31 and IS011845 methods is that it might allow for indirect real-time estimates of the dimensions of a degradable alloy part exposed to well-defined environmental conditions.
Authors: Abhishek Mukherjee, Nicolo' Campagnol, Joris Van Dyck, Jan Fransaer, Bart Blanpain
Yttria stabilized zirconia (YSZ), as an excellent oxygen ion conductor, is increasingly used as an oxygen ion membrane for the anode in the FFC Cambridge process. However, using a membrane implies that it exhibits long term stability in the bath. It has been reported that YSZ is stable chemically, but fails electrochemically in molten CaCl2-CaO.
Authors: M.M. Sadawy, A.F.Ismael, M.A.Gouda
This paper addresses the issue of modeling the uncertainty about the corrosion values of oil steel tank, at any particular unsampled location. Our method is based on using geostatistics technique for modeling steel tank thickness from nondestructive data.
Authors: Jingkun Yu, Chengwan Cui, Xinzhong Tian, Liangcai Zhong, Xinli Wang, Wenbin Dai
In order to improve the thermal shock resistance of yttria by forming coarse grain with closed pores, a proper additive was firstly selected among calcium nitrate, cerium nitrate, and neodymium nitrate. Then, the effect of calcia on the grain growth of yttria was investigated.
Authors: Ian V. Kidd, Elan J. Weiss, Laura S. Bruckman, Olivier Rosseler, Roger H. French
Optical and chemical properties are used to track degradation of hardcoat acrylic systems with PET and TPU substrates. Magnitude and variance of yellowness is correlated to UV irradiance, 0.92 and haze is correlated to moisture in UV irradiance, 0.84, in PET substrate candidates.
Authors: Lindsey Goodman and Eric Caldwell
As oil and gas extraction moves deeper and farther offshore, many technical challenges arise. Deeper wells are often produced with flowing wellhead temperatures in excess of 300°F (150°C), and equipment is subject to hydrostatic conditions nearing 5,000 psi (345 bar) hydrostatic pressure. Despite high temperatures of produced fluids, it is often necessary to insulate subsea production equipment and flow-lines to prevent blockages such as hydrates and waxes that can form during shutdowns.
Authors: Yunusa A. Balogun, Ryan Ubelhor
The likelihood of successful system operation following long periods of dormancy can be increased by assessing the long-term environmental effects on the performance of materials and subsystems. Because of the long experimental times often required in many accelerated aging programs, the need for faster and more reliable methods for investigating the degradative aging of polymeric materials under various environments becomes important.