Author
J. Rezek
Bio: J. Rezek is an academic researcher from Rafael Advanced Defense Systems. The author has contributed to research in topics: Corrosion & Maraging steel. The author has an hindex of 2, co-authored 2 publications receiving 50 citations.
Papers
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TL;DR: The microstructure of oxides formed on 250 maraging steel in steam at elevated temperatures was established as discussed by the authors, which consisted of at least two sub-layers, an innermost layer of austenitic phase and a layer of magnetite Fe 3 O 4.
36 citations
TL;DR: In this article, the authors compared the oxides formed on 250 maraging steel in steam at elevated temperatures to standard phosphating treatment and found that the advantage of these oxides over phosphating was due to the austenitic sub-layer.
21 citations
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TL;DR: In this paper, 4-(N,N-diethylamino)benzaldehyde thiosemicarbazone (DEABT) was studied for its corrosion inhibition property on the corrosion of aged 18 Ni 250 grade maraging steel in 0.67 M phosphoric acid at 30-50°C by potentiodynamic polarization, EIS and weight loss techniques.
64 citations
TL;DR: In this article, the effects of using air as the treatment atmosphere of glow-discharge post-oxidising treatment have been evaluated, and the results show that the nitriding+623 K postoxidizing treatment is able to significantly improve the corrosion resistance of the untreated and treated AISI H11 samples.
Abstract: Post-oxidising treatments can be performed to improve the corrosion resistance of nitrided steel components. The glow-discharge process appears particularly attractive, since it allows to carry out both nitriding and post-oxidising treatments in a single technological operation, simply varying the treatment atmosphere and the working conditions. In the present paper the effects of using air as the treatment atmosphere of glow-discharge post-oxidising treatment have been evaluated. Nitriding treatments were performed at 773 K for 5 h, and post-oxidising treatments were carried out at 623 and 773 K for 1 h. The nitriding and nitriding+post-oxidising treatments produce modified surface layers consisting of an outer compound layer and an inner diffusion layer. When the post-oxidising treatments are performed, the compound layer consists of an oxide layer on the top of the nitride layer. With a 623 K post-oxidising treatment the oxide layer consists mainly of magnetite, Fe 3 O 4 , while when post-oxidising is carried out at 773 K it consists essentially of hematite, Fe 2 O 3 . In the inner nitride layer iron (γ′-Fe 4 N, e-Fe 2–3 N) and chromium (CrN) nitrides are present. In all the treated samples high hardness values are obtained in the modified layers. The hardness profiles of the post-oxidised samples are only slightly affected by the 773 K post-oxidising treatment. The corrosion resistance of the treated samples was tested and the results show that the nitriding+623 K post-oxidising treatment is able to significantly improve the corrosion resistance of the untreated and treated AISI H11 samples.
58 citations
TL;DR: In this article, the duplex treatment of plasma nitriding and post-oxidation of AISI 1045 plain carbon steel which is used in manufacture of shock absorber rods in automotive industry was carried out at 550°C for 5h in atmosphere having nitrogen and hydrogen with volume ratio of 3 to 1.
57 citations
TL;DR: In this article, the corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulfuric acid by 3,4-dimethoxybenzaldehydethiosemicarbazone (DMBTSC) has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques.
Abstract: The corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulfuric acid by 3,4-dimethoxybenzaldehydethiosemicarbazone(DMBTSC) has been investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) techniques. The inhibition efficiency increased with the increase in inhibitor concentration and decreased with the increase in temperature. Polarization curves indicated mixed type inhibition behavior affecting both cathodic and anodic corrosion currents. The thermodynamic parameters of corrosion and adsorption processes were evaluated. The adsorption of DMBTSC on the aged maraging steel surface was found to obey the Langmuir adsorption isotherm model, and the calculated Gibb’s free energy values confirm the spontaneous adsorption. The results obtained by the two techniques were in good agreement.
50 citations
TL;DR: In this article, a 1.0-M sulfuric acid solution containing different concentrations of 2-(4-chlorophenyl)-2-oxoethyl benzoate (CPOB) was used to investigate the corrosion behavior and hydrogen evolution reaction of weld aged maraging steel.
41 citations