Corrosion performance of a corrosion-resistant rail steel in the simulated subsea tunnel environment

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qi Zhang ◽  
Min Zhu ◽  
Feng Cai ◽  
Man Liu ◽  
Xue Su ◽  
...  
Keyword(s):  
High Speed ◽  
Rail Steel ◽  
Salt Spray ◽  
Neutral Salt ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
High Speed Rail ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Subsea Tunnel

Abstract The corrosion performance of a newly developed corrosion-resistant rail steel (U68CuCr) was investigated and compared with that of a normally used high-speed rail steel (U71MnG) by neutral salt spray tests, electrochemical tests, X-ray diffraction analyses, and the scanning vibrating electrode technique. It was found that the weight loss and corrosion rate of U68CuCr were lower than those of U71MnG under the same corrosion conditions. In addition, due to the influence of alloying elements (copper and chromium) in U68CuCr, the rust layer was thicker and denser, resulting in a stronger protective effect. Moreover, U68CuCr had a higher corrosion potential in electrochemical tests. Finally, the dynamic corrosion process of U68CuCr in 2.2% NaCl solution mainly followed a lateral extension of corrosion. Therefore, the corrosion resistance of U68CuCr was better than that of U71MnG in the subsea tunnel environment.

scholarly journals Study on Corrosion Resistance and Wear Resistance of Zn–Al–Mg/ZnO Composite Coating Prepared by Cold Spraying

Coatings ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 505
Author(s):  
Xinqiang Lu ◽  
Shouren Wang ◽  
Tianying Xiong ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Cold Spraying ◽  
Neutral Salt ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Long Term Stability ◽  
Spray Technique

Two composite coatings, Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15, were prepared by the cold spray technique and were found to be compact, with no pits or cracks, based on scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) investigations. The results of the neutral salt spray (NSS) and electrochemical tests showed that the two composite coatings possess a suitable corrosion performance. However, the Zn45Al35Mg5ZnO15 composite coatings were more corrosion resistant and allowed a better long-term stability. In addition, they were found to exhibit the best wear resistance and photocatalytic degradation efficiency.

Influence of Al-Mg-Ce on the Anti-Corrosion Performance of the Hot-Dip Coating

2013 ◽  
Vol 427-429 ◽  
pp. 396-399
Author(s):  
Wei Hua Zhao ◽  
Guo Tian Li ◽  
Hui Lian ◽  
Guo Xin Li
Keyword(s):  
Loss Rate ◽  
Salt Spray ◽  
Dip Coating ◽  
Neutral Salt ◽  
Congruent Melting ◽  
Corrosion Performance ◽  
X Ray Diffraction ◽  
Weight Loss Rate ◽  
X Ray ◽  
Salt Spray Testing

The hot-dip coatings containing pure Zn and Zn-4.5Al-0.05Mg-0.03~0.12Ce were prepared through congruent melting. The interface of the hot-dip coating was researched by the scanning electron microscope (SEM) after polished and etching, and the results showed that the alloying elements were uniformly dispersed in the coating. The anti-corrosion performance of the coatings was researched using the weight loss rate by the neutral salt spray testing. The reasons of the effects of the elements Al-Mg-Ce on the anti-corrosion performance promoting were researched through SEM and X-ray diffraction analysis (XRD). The results showed that the protective effect of the Zn-4.5Al-0.05Mg-0.09Ce coating for the steel was enhanced by the electrochemical action.

Investigation on wear and damage characteristics of high-speed rail steel with plasma selective quenching

Wear ◽  
2021 ◽  
Vol 486-487 ◽  
pp. 204100
Author(s):  
Jingmang Xu ◽  
Kai Wang ◽  
Xinyuan Liang ◽  
Qiang Guo ◽  
Ping Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Rail Steel ◽  
High Speed Rail ◽  
Damage Characteristics

Research on the Anti- Corrosion Performance of Two Hot-Dip Coatings

2012 ◽  
Vol 598 ◽  
pp. 520-523
Author(s):  
Zhi Min Cao ◽  
Guo Xin Li ◽  
Hui Lian ◽  
Da Wei Hu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Salt Spray ◽  
Element Composition ◽  
The Other ◽  
Neutral Salt ◽  
Reaction Products ◽  
Corrosion Performance ◽  
Productive Process ◽  
Scanning Electron

Samples covered two kinds of hot-dip coatings were purchased and placed in neutral salt spray to study the anti-corrosion performance. The results showed that one sample was eroded more seriously than the other. The reasons were analyzed through surface morphology and the reaction products of the hot-dip coatings by scanning electron microscope and element composition. The results showed that might be the fractures developed of the corroded sample during the productive process that made O2 and solution contact with the substrate.

New Passivating Method to Galvanized Zn Coatings on Steel Substrate

2010 ◽  
Vol 163-167 ◽  
pp. 4555-4558 ◽  
Author(s):  
Yun Ying Fan ◽  
Ye Hua Jiang ◽  
Rong Zhou
Keyword(s):  
Corrosion Resistance ◽  
Steel Substrate ◽  
Environmental Awareness ◽  
Salt Spray ◽  
Operating Conditions ◽  
Neutral Salt ◽  
Corrosion Performance ◽  
Solution Composition ◽  
Passivation Time

As the increasing environmental awareness, to explore no-chromium passivation technique on galvanized Zn coatings becomes one of the most urgent affair. In this paper, one kind of silicate passivation technics was invented and by which method silicate conversion film on galvanized Zn coatings with satisfactory property was got. It is found that solution composition and operating conditions of passivation affect the property of conversion film markedly, and the optimal technics is: Na2SiO3 20 g/L, H2SO4 5 mL/L, HNO3 5 mL/L, H2O2 10 ml/L, pH 2.0, passivation time 20 s, temperature 25°C. The corrosion resistance of galvanized Zn coatings with different passivated method, including no passivated, Cr(VI) passivated, Cr(III) passivated and silicate passivated, were investigated by NSS test (5% Neutral Salt Spray). The silicate conversion film can keep no rust for 72 h and obviously shows the best property. All the results show that silicate passivation can provide galvanized Zn coatings superior anti-corrosion performance, so this new technics can replace the conventional chromate passivation technology to avoid the pollution of chromium and has a wider application in future.

scholarly journals Calcium Doped Flash-PEO Coatings for Corrosion Protection of Mg Alloy

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 916 ◽  
Author(s):  
Ewa Wierzbicka ◽  
Borja Pillado ◽  
Marta Mohedano ◽  
Raul Arrabal ◽  
Endzhe Matykina
Keyword(s):  
Salt Spray ◽  
Neutral Salt ◽  
Corrosion Performance ◽  
Full System ◽  
System Protection ◽  
Epoxy Primer ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
Hydrolysis Of

This study demonstrates a significant improvement of the corrosion resistance of an AZ31B magnesium alloy achieved by the application of 1 μm-thin coatings generated by an environmentally friendly flash plasma electrolytic oxidation (FPEO) process in Ca-containing electrolytes. Two compounds with different solubility, calcium oxide (CaO) or calcium glycerophosphate (CaGlyP), were used as sources of Ca in the electrolyte. Very short durations (20–45 s) of the FPEO process were employed with the aim of limiting the energy consumption. The corrosion performance of the developed coatings was compared with that of a commercial conversion coating (CC) of similar thickness. The viability of the coatings in a full system protection approach, consisting of FPEO combined with an inhibitor-free epoxy primer, was verified in neutral salt spray and paint adhesion tests. The superior corrosion performance of the FPEO_CaGlyP coating, both as a stand-alone coating and as a full system, was attributed to the formation of a greater complexity of Ca2+ bonds with SiO2 and PO43− species within the MgO ceramic network during the in situ incorporation of Ca into the coating from a double chelated electrolyte and the resultant difficulties with the hydrolysis of such a network. The deterioration of the FPEO_CaGlyP coating during immersion was found over ten times slower compared with Ca-free flash-PEO coating.

Characterization of a Chromium-Free Passivation Coating on Hot Dip Al-Zn Allay Coated Steel Sheets

2013 ◽  
Vol 634-638 ◽  
pp. 2931-2934
Author(s):  
Ping Yuan
Keyword(s):  
Salt Spray ◽  
Optical Emission ◽  
Acrylic Resin ◽  
Organic Coating ◽  
Neutral Salt ◽  
Coated Steel ◽  
Corrosion Performance ◽  
Steel Sheets ◽  
Coated Steel Sheet ◽  
Passivation Coating

The hot dip Al-Zn alloy coated steel sheet was passivated with chromium-free passivation solution which adopted the molybdate and acrylic resin as the main film-forming substances. The surface morphology and corrosion performance of the coating were studied experimentally by using glow discharge optical emission spectroscopy(GD-OES), scanning electron microscopy(SEM) and energy-dispersive X-ray spectroscopy(EDS), polarization curves and the neutral salt spray test. The GD-OES and SEM results show that the molybdate-containing thin organic coating is deposited on the substrate compactly and homogeneously without obvious tiny cracks. The test results of corrosion performance show that the corrosion potential and current density of the passive films decrease obviously in comparison with those of the substrate, and the corrosion resistance of the coating is comparable with that of the chromate passivation coating.

Anti-Corrosion Performance of the Hot-Dip Coating Containing Zn-Al-Mg-Ce

2013 ◽  
Vol 423-426 ◽  
pp. 173-176 ◽  
Author(s):  
Guo Xin Li ◽  
Dong Yang ◽  
Yi Liang Peng ◽  
Wei Tong Yue
Keyword(s):  
Weight Loss ◽  
Loss Rate ◽  
Salt Spray ◽  
Dip Coating ◽  
Neutral Salt ◽  
Congruent Melting ◽  
Corrosion Performance ◽  
Weight Loss Rate ◽  
Salt Spray Testing ◽  
Scanning Electron

The hot-dip coatings containing Zn-Al-Mg-Ce were prepared through congruent melting. The anti-corrosion performance of the coatings was researched using the weight loss rate by the neutral salt spray testing. The reasons of the effects of the elements Al, Mg, Ce on the anti-corrosion performance promoting were researched through the analysis of Scanning Electron Microscope and the polarization curves. The results showed that Al, Mg, Ce embedded in the Zn matrix uniformly and the protective effect for the steel was enhanced by the electrochemical action.

Influence of Silane on Corrosion Performance of Silane-Modified Acrylate Interpenetrating Polymer Network Coating on Magnesium Alloy AZ31

2011 ◽  
Vol 686 ◽  
pp. 186-191
Author(s):  
Rong Chang Zeng ◽  
Chen Lan Liu ◽  
Ling Hong Kong ◽  
Hong Zhi Cui
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Salt Spray ◽  
Polymer Network ◽  
Az31 Alloy ◽  
Interpenetrating Polymer Network ◽  
Neutral Salt ◽  
Corrosion Performance ◽  
Alloy Az31 ◽  
Magnesium Alloy Az31

The possibility that various silane treatments may enhance the corrosion resistance of a magnesium alloy AZ31 with silane-modified acrylate interpenetrating polymer network (IPN) coating has been investigated. Potentiodynamic electrochemical tests and neutral salt spray test were applied to evaluate the corrosion performance of the alloy. The results show that silane film improves corrosion resistance of the AZ31 alloy with and without IPN coating. The silane-modified IPN coatings improved more than 4 orders of magnitude of the corrosion resistance of the substrate.

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