Effect of SiC Particulates on the Corrosion Behavior of Extruded AZ91/SiCp Composites during the Early Stage of Exposure

2015 ◽  
Vol 162 (14) ◽  
pp. C754-C766 ◽  
Author(s):  
Chunyan Zhang ◽  
Tao Zhang ◽  
Yanqiu Wang ◽  
Fangfang Wei ◽  
Yawei Shao ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Early Stage ◽  
Sic Particulates

scholarly journals Effect of Weld and Surface Defects on the Corrosion Behavior of Nickel Aluminum Bronze in 3.5% NaCl Solution

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1227
Author(s):  
Xu Zhao ◽  
Yuhong Qi ◽  
Jintao Wang ◽  
Tianxiang Peng ◽  
Zhanping Zhang ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Corrosion Behavior ◽  
Early Stage ◽  
Optical Microscope ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Corrosion Product Film ◽  
Product Film ◽  
Nickel Aluminum Bronze

To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.

scholarly journals Corrosion Behavior of Corrosion-Resistant Spring Steel Used in High Speed Railway

2021 ◽  
Vol 11 (18) ◽  
pp. 8668
Author(s):  
Jinbo Li ◽  
Ziying Zhu ◽  
Hongwei Chen ◽  
Shaojie Li ◽  
Hongyan Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
High Speed ◽  
Corrosion Potential ◽  
Early Stage ◽  
Corrosion Current ◽  
Corrosion Products ◽  
Atmospheric Environment ◽  
Rust Layer ◽  
Experimental Steel

Corrosion behavior of 60Si2Mn-A and 60Si2Mn-B in simulated industrial atmospheric environment was investigated by alternate immersion corrosion test and electrochemical method. The phase, morphology, characteristics of corrosion products, and the distribution of Cr, Cu, and Ni in the corrosion products of experimental steel were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results show that the phase of rust layer is Fe3O4 and γ-FeOOH in the early stage and then changes to α-FeOOH and γ-FeOOH in the later stage; the size of the rust layer with corrosion resistance of 60Si2Mn is less than 60Si2Mn; the Cr element accumulates in the rust layer of the experimental steel in the early stage of corrosion resistance; and Cu, Ni, and Cr in the corrosion resistance 60Si2Mn are concentrated in the rust layer near the substrate In the later stage of corrosion. As the corrosion cycle is prolonged, the corrosion potential and the resistance of the rust layer of the experimental steel increases, and the corrosion current decreases; in the same corrosion cycle, the corrosion potential and corrosion resistance of 60Si2Mn-B are greater than 60Si2Mn, and the corrosion current is less than 60Si2Mn.

Effect of Microbes on the Early Corrosion Behavior of Carbon Steel in Eutrophic Lake

2008 ◽  
Vol 373-374 ◽  
pp. 456-459
Author(s):  
Li Whu Jiang ◽  
G. Cao ◽  
Xu Hui Mao ◽  
Fu Xing Gan
Keyword(s):  
Carbon Steel ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Ferric Oxide ◽  
Concentration Ratio ◽  
Early Stage ◽  
Relative Concentration ◽  
Electrochemical Techniques ◽  
Eutrophic Lakes ◽  
Eutrophic Water

In China’s freshwater environment, the eutrophication phenomenon has become more and more serious in recent years. The changes of water quality may induce the variation of metal’s corrosion behavior. In this paper, carbon steel as common material of hydraulic structure was the investigated object, and its early corrosion behavior affected by microbes (algae and microbe) in eutrophic lakes was studied using immersion test, electrochemical measurements and infra-red spectrometry techniques. The experimental waters were natural eutrophic water and microbescleaned water. The former was fetched from eutrophic East Lake in Wuhan City, Hubei Province of China, and the preparation of later was making natural eutrophic water sterilized and algae removed by UV radiation. In order to present the changes of carbon steel’s corrosion behavior in natural eutrophic freshwater with and without microbes, comparative experiments were conducted in lab. Both weight loss method and electrochemical techniques showed that, the corrosion rates of carbon steel decreased in early stage for the influence of microbe existence. The analysis of infrared spectra indicated that, corrosion product on the surface of coupons taken from natural eutrophic water, mainly were δ hydroxyl ferric oxide, magnetic iron ore, γ hydroxyl ferric oxide, α hydroxyl ferric oxide and β hydroxyl ferric oxide, with relative concentration ratio of 1:0.314:1.003:0.634: 0.654. While corrosion product on the surface of carbon steel taken from the microbes-cleaned water, mainly were α hydroxyl ferric oxide and γ hydroxyl ferric oxide, with relative concentration ratio of 1:1.215.

Corrosion Behavior of Galvanized Steel for Grounding Grids in the Red Clay Soil

2014 ◽  
Vol 1056 ◽  
pp. 30-33
Author(s):  
Ai Jun Yan ◽  
Yu Pei Shao ◽  
Yu Na Wang ◽  
Shu Qi Zhao ◽  
Qiang Qiang Liao
Keyword(s):  
Corrosion Behavior ◽  
Immersion Time ◽  
Clay Soil ◽  
Electrochemical Impedance ◽  
Early Stage ◽  
Steel Corrosion ◽  
Corrosion Current ◽  
Galvanized Steel ◽  
Red Clay ◽  
Grounding Grids

The corrosion behavior of galvanized steel for grounding grids in the red clay soil was studied by electrochemical impedance spectroscopy (EIS) and polarization curve measurement. The results show that the Iron-Aluminitma oxides can promote the galvanized steel corrosion in red solution. The resistance decreased with the increase of immersion time and the latter stage is less than the early stage. The corrosion current density of galvanized steel decreased with the increase of the content of Iron-Aluminitma oxides of soil solution.

Insights into the Electrochemical Corrosion Behavior and Mechanism of Electroless Ni-P Coating in the CO2/H2S/Cl− Environment

CORROSION ◽  
10.5006/3371 ◽  
2020 ◽  
Vol 76 (6) ◽  
pp. 578-590 ◽  
Author(s):  
Jiankuan Li ◽  
Chong Sun ◽  
Morteza Roostaei ◽  
Mahdi Mahmoudi ◽  
Vahidoddin Fattahpour ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Surface Characterization ◽  
Early Stage ◽  
Adsorbed Layer ◽  
Electrochemical Corrosion ◽  
Degradation Process ◽  
Localized Corrosion ◽  
Co2 Corrosion ◽  
Electrochemical Corrosion Behavior ◽  
Electroless Ni

The electrochemical corrosion behavior of Ni-P coating in 3.5 wt% NaCl solution-containing CO2 and H2S was investigated using electrochemical methods and surface characterization techniques. The results show that the presence of H2S can enhance the CO2 corrosion of Ni-P coated carbon steel by affecting both anodic and cathodic processes. The adsorbed layer only exists in the very early stage of corrosion and barely improves the anticorrosion performance of the coating. The formation of corrosion products (NiO and Ni3S2) renders temporary protection during immersion, but the addition of H2S accelerates the diffusion process at the electrolyte/coating interface and promotes the electrolyte penetration through the coating, causing severe localized corrosion and coating disbondment. A corrosion model is proposed to illustrate the corrosion and degradation process of Ni-P coated steel in the CO2/H2S/Cl− environment.

Sem Studies of Co-Cr-Mo Surgical Implant Alloy Corrosion Behavior

1982 ◽  
Vol 40 ◽  
pp. 520-521
Author(s):  
Ann Chidester Van Orden ◽  
John L. Chidester ◽  
Anna C. Fraker ◽  
Pei Sung
Keyword(s):  
Electron Microscopy ◽  
Corrosion Behavior ◽  
Anodic Polarization ◽  
Saline Solution ◽  
Saturated Calomel Electrode ◽  
Physiological Saline ◽  
X Ray ◽  
Physiological Saline Solution ◽  
Scanning Electron

The influence of small variations in the composition on the corrosion behavior of Co-Cr-Mo alloys has been studied using scanning electron microscopy (SEM), energy dispersive x-ray analysis (EDX), and electrochemical measurements. SEM and EDX data were correlated with data from in vitro corrosion measurements involving repassivation and also potentiostatic anodic polarization measurements. Specimens studied included the four alloys shown in Table 1. Corrosion tests were conducted in Hanks' physiological saline solution which has a pH of 7.4 and was held at a temperature of 37°C. Specimens were mechanically polished to a surface finish with 0.05 µm A1203, then exposed to the solution and anodically polarized at a rate of 0.006 v/min. All voltages were measured vs. the saturated calomel electrode (s.c.e.).. Specimens had breakdown potentials near 0.47V vs. s.c.e.

Sign in / Sign up

Export Citation Format

Share Document