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linear-polarization-resistance
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Corrosion investigation of pipeline steel in hydrogen sulfide containing solutions
, Article Journal of Applied Sciences ; Volume 12, Issue 23 , 2012 , Pages 2454-2458 ; 18125654 (ISSN) ; Taheri, H ; Ismail, M. C ; Dolati, A ; Sharif University of Technology
Abstract
The hydrogen-induced cracking (HIC) behavior of X70 pipeline steel was studied by means of Linear Polarization Resistance (LPR), hydrogen permeation tests, weight loss and Scanning Electron Microscopy (SEM). In this study, the dissolved HZS was created by chemical reactions in solution. The specimens were immersed into synthetic sea water saturated with HZS. The experimental results showed that the increase of exposure time and HZS concentration leads to an increase of the hydrogen content in X70 steel, which plays a key role in the initiation and propagation of HIC
Experimental design for optimizing the corrosion resistance of pulse reverse electrodeposited graphene oxide thin film
, Article Journal of Solid State Electrochemistry ; Volume 19, Issue 5 , May , 2015 , pp 1367–1380 ; 14328488 (ISSN) ; Afshar, A ; Sharif University of Technology
Springer New York LLC
2015
Abstract
In this study, linear polarization resistance (LPR) of pulse reverse electrodeposited graphene oxide (PREGO) coating is optimized by design of experiments approach (central composite design). Pulse current density (i), cathodic (Tc) and anodic (Ta) pulse durations, and total electrodeposition time (Tt) are selected as the substantial factors. The best prediction model proposes a definitive linear relation without any significant interaction of the LPR by analysis of variance. The desirable value of LPR was predicted equal to 5358 Ω cm2, obtaining at the pulse current density of 235.62 mA cm−2, Ta of 7.75 ms, Tc equal to 3.25 ms (f = 100 Hz), and Tt of approximately 225 s. Appearance of the...