...Dongyang Li; Ming Liu; Linya Zhao; Yuyuan Guan; Lining Xu; Hui Ji; Duoer Shi; L.J. Qiao Inconel 625 for hydrogenation heat exchangers was studied to investigate its failure behavior in a hydrogen-containing environment. Hydrogen was introduced into Inconel 625, and the effect of hydrogen on pitting...

...Haval Bashar Mohammed Ali A pitting corrosion study of Tungsten Inert Gas (TIG) welded Type 316L austenitic stainless steels has been addressed. The results were correlated to the microstructural features of the alloy. The microstructure examination showed that samples consisted mainly of ferrite...

...Rulei Lan; Longlin Lei; Xiheng Sun; Jin Li; Yiming Jiang; Yangting Sun This study investigates the influence of the sigma phase in 446 stainless steel on the pitting process in a Br⁻ environment after heat treatment, as well as its relationship with (Ti, Nb) primary precipitates. We find...

... combined with energy dispersive x-ray spectrometry and other methods. The results showed that inclusions were the main sites for pitting corrosion initiation in cast 2205 welded joints, and the MnS portion of the composite inclusions preferentially dissolved to form micropits, which triggered pitting...

...Guoyong Ran; Donghua Suo; Zhaoping Luo; Yiming Jiang; Jin Li; Kezhao Liu; Yangting Sun Inclusion-induced pitting is a highly random and intricate process. This study aims to investigate the impact of surface mechanical rolling treatment (SMRT) on the pitting behavior of 2205 duplex stainless steel...

... H₂S reduced the rate to 1.00 mm/y, showing a 60% inhibition efficiency. However, the highest pitting corrosion rate of 6.30 mm/y occurred at 30 ppm H₂S, with a maximum pit depth of 123 μm. The results suggest that lower H₂S concentrations lead to localized corrosion, while higher...

... of hydrogen evolution and electrochemical techniques underestimating magnesium corrosion rates. A new procedure for combining these is proposed. bimodal corrosion magnesium mechanisms pitting M agnesium alloys have long been of interest because of their light weight. They have found various...

...R. Case; H. Castaneda; Y. Ding; D. Narayanan; A. Khan; M. Cedeño; G. Peña The influence of the microstructure on the resistance to pitting potential in austenitic stainless steel UNS S31603 is evaluated to explain the effect of the distribution of features such as carbides. Different...

... crevice dissolved oxygen galvanostatic modeling pitting potentiodynamic potentiostatic repassivation potential stainless steel UNS S31603 UNS S32205 I n the upstream oil and gas industry, corrosion-resistant alloys (CRAs) are widely selected to handle seawater and brines in piping...

... bipolar electrode pitting reference electrode UNS S30400 UNS N08031 B ipolar electrodes (BPEs) embody a fascinating phenomenon of electric conductivity, catalyzing electrochemical reactions in an electrically conductive material on its opposing ends without necessitating a direct ohmic...

... optical emission spectroscopy (GDOES). As supported by the immersion tests and electrochemical measurements, HESPed GTD-111 exhibits corrosion film with higher resistance and lower passivity current density at the expense of a higher initial corrosion rate. Both samples suffer pitting corrosion; however...

... conditions, produce localized pitting corrosion of adjacent steel bars. This may continue, under the hydrogen evolution cathodic reaction with the build-up of rusts causing localized concrete failure, followed by exposure of the steel to the environment, removal of the elevated concrete pH, and a subsequent...

...Edgar C. Hornus; Martín A. Rodríguez; Mariano A. Kappes This work describes an inexpensive holder for corrosion experiments, developed to avoid crevice corrosion during pitting corrosion tests of corrosion-resistant alloys. It is based on a flooded gasket, incorporated in a Stern-Makrides sample...

... the two H₂SO₄ concentrations. In 1 wt% H₂SO₄, pitting was the major form of corrosion attack in the presence of chlorides, whereas uniform corrosion dominated in 10 wt% H₂SO₄. The pitting corrosion tendency for the three stainless steel...

... in outdoor conditions for 12 months followed by insulation removal and detailed characterizations. Corrosion behaviors of steel coupons were studied using weight loss, pit depth measurement, surface profile topography, and scanning electron microscopy, whereas chemical compositions of the corrosion products...

... solutions with different water contents, is examined in this paper. Cyclic potentiodynamic polarization tests indicated that water increased the pitting and repassivation potentials and the critical temperature at which localized corrosion occurred in chloride solutions. The effect of water on repassivation...

...-mail: [email protected] . 10 March 2022 25 April 2022 25 April 2022 © 2022, AMPP 2022 boiler deposit pitting steam under deposit corrosion A lmost all significant industrial facilities operate a large steam system comprising multiple steam generators (typically waste heat...

...Mayra Vanegas; Ke Wang; Mariano Iannuzzi In this Technical Note, four foil sample preparation methodologies were investigated with “sandwich” like foil electrodes, which enabled the visualization of two-dimensional pit morphologies. The new procedure included the use of nitric acid to prepassivate...

... polarization tests in 3.5 wt% NaCl solution yielded a corrosion current density, i_corr of 1.4 × 10⁻⁶ A/cm² and corrosion potential, E_corr of −55 mV_Ag/AgCl electrode. Immersion tests in salt water for a period of 96 h showed hardly any pit formation...

... methodologies, without significant compromise. FBB8+Ti, a novel ferritic steel strengthened by Heusler- and B2-strengthening phases, is one such alloy and is investigated here across a range of titanium concentrations for its corrosion performance in a chloride environment. Pitting potentials, corrosion rates...