Corrosion Behavior of a Predeformed Fe-Ni Lateritic Steel with Bainite Structure

In a railway track for intermodal usage between a train station to a port, an observation on corrosion behavior of the track alloy in the coastal environment needs to be considered. In this study, Fe-Ni lateritic steel with bainite structure is observed. This alloy is developed from lateritic ores in Indonesia as an alternative to the conventionally made Fe-Ni steels. This study aims to determine the effect of cold rolling and austempering processes on the corrosion properties of the alloy. The cold-rolling reductions used are 30% and 70%, followed by an austempering process at 400°C for 30 mins with air cooling. The corrosion test was performed on four different samples-- First, a before deformation sample. Second, 30% and 70% cold-rolled samples. Third, austempered without deformation samples. Besides, fourth, deformed austempered samples. The corrosion test method implemented was the CASS Method for 2, 4, and 6 days. The highest corrosion rate obtained by 30% cold rolling, and the corrosion rate is increased as the austempering addition. The microstructures of rust are approximately porous few compact, near to voluminous coarse-grain corrosion products, and tend to crack.

Download Full-text

Effect of Structural Modification on Corrosion Behavior of Hypo Eutectic Al-Si Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.778.16 ◽

2018 ◽

Vol 778 ◽

pp. 16-21

Author(s):

Muhammad Mansoor ◽

Muhammad Kamran Yaseen ◽

Shaheed Khan

Keyword(s):

Corrosion Rate ◽

Corrosion Behavior ◽

Earth Metal ◽

Alloy System ◽

Eutectic Phase ◽

Al Alloy ◽

General Corrosion ◽

Corrosion Properties ◽

Unmodified Alloy ◽

Cast Alloys

Al-Si eutectic cast alloys are widely used in aeronautical and automobile industries where significantly high strength, toughness and wear resistance are required. This class of cast alloys exhibit relatively low corrosion resistance in brine environments. The mechanical properties of the alloy system mainly depend upon the shape of Si rich eutectic phase, which mainly has acicular geometry. In present research, the effect of modified microstructure of 12 wt. % Si-Al alloy on corrosion behavior was studied. The needle like Si rich eutectic phase was modified to disperse spherical structure using rare earth metal halides. The corrosion rate and pitting behavior of modified and unmodified alloy were evaluated in 3.5% NaCl solution by general corrosion for calculated time. It was observed that the corrosion rate and pitting tendency of modified alloy had been appreciably reduced as compare to unmodified alloy. The improvement of corrosion properties were the attributes of changed morphology and distribution of Si rich eutectic phase.

Download Full-text

Effect of coating parameters on microstructure, corrosion behavior, hardness and formability of hot-dip Galfan and galvanized coatings

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.1515/ijmr-2020-7991 ◽

2021 ◽

Vol 112 (4) ◽

pp. 321-332

Author(s):

Amirreza Khezrloo ◽

Farshid Rezazadeh ◽

Mohammad Rajaee ◽

Morteza Tayebi ◽

Ermia Aghaie ◽

...

Keyword(s):

Corrosion Rate ◽

Corrosion Behavior ◽

Process Parameters ◽

Immersion Time ◽

Process Temperature ◽

Corrosion Properties ◽

Steel Sheets ◽

Mechanical And Corrosion Properties ◽

Galvanized Coatings ◽

Dipping Time

Abstract In the current study, zinc–aluminum (Galfan) and zinc (galvanized) coatings were coated on steel sheets using the hot-dip technique. The effect of process parameters on the microstructure, corrosion behavior, hardness, and formability of the coatings was assessed. The results demonstrated that both the corrosion area and corrosion rate of the galvanized coatings were reduced by increasing the immersion time. In contrast, the process temperature did not affect the corrosion behavior. Furthermore, by prolonging the dipping time, the hardness of the coatings decreased. The Galfan coatings showed higher formability and the superiority of mechanical and corrosion properties of Galfan coatings over conventional galvanized coatings was indicated.

Download Full-text

A Study of PM Mg-HAP Composite: Corrosion and Microstructural Evaluation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.754-755.998 ◽

2015 ◽

Vol 754-755 ◽

pp. 998-1001 ◽

Cited By ~ 1

Author(s):

Zuraidawani Che Daud ◽

Faliq bin Fuad ◽

M. Nazree Derman

Keyword(s):

Powder Metallurgy ◽

Corrosion Rate ◽

Corrosion Behavior ◽

Corrosion Test ◽

Optical Microscope ◽

Alloy Sample ◽

Biomedical Implant ◽

Hydroxyapatite Particle ◽

Surrounding Environment ◽

Microstructural Evaluation

Mg-HAP Composite produce by powder metallurgy (PM) methods is one new biomaterial usually applied as biomedical implant. However, the sensitive Mg metal to surrounding environment is giving the bad impact for this biomaterial because of the presence hydroxyapatite particle in Mg matrix. The aim of this work is to study the corrosion behavior and microstructural evaluation of composite biomaterial Mg with different percentage of Hyroxyapatite (HAP) (5, 10, 15 and 20 wt. %) produced by powder metallurgy (PM) method. The corrosion test was done using electrochemical methods and the microstructure after corrosion test was observed using optical microscope. Based on the results, the different percentages of HAP were influenced the corrosion rate of the Mg-HAP composite. The percentage of HAP content in Mg were greatly influences the corrosion behavior of the alloy. Sample Mg-20wt% HAP has the lowest corrosion rate which is 0.16mm per year, while sample Mg-15wt% HAP has the highest corrosion rate, 0.37 mm per year.

Download Full-text

Effect of heat treatment on bio-corrosion rate of steel structure (API 5L) in marine evironment

MATEC Web of Conferences ◽

10.1051/matecconf/201819704002 ◽

2018 ◽

Vol 197 ◽

pp. 04002

Author(s):

Herman Pratikno ◽

Harmin Sulistiyaning Titah ◽

Bima Ero Dwi Syahputra

Keyword(s):

Heat Treatment ◽

Corrosion Rate ◽

Corrosion Test ◽

Treatment Process ◽

Thiobacillus Ferrooxidans ◽

Steel Structure ◽

Test Method ◽

Heat Treatment Process ◽

Immersion Corrosion ◽

Seawater Salinity

One of the cause of corrosion is the attachment of bacteria or commonly called as bio-corrosion or Microbial Influenced Corrosion (MIC). This aim of the research was to determine effect of heat treatment process on the bio-corrosion rate of API 5L steel. The treatments were namely, without heat treatment as a control, and with the heat treatment (austempering process). The austenizing process was conducted before the austempering process. All specimens without and with the heat treatment were be used on bio-corrosion test. The bio-corrosion testing was conducted with immersion corrosion test method with artificial seawater salinity of 35‰. Three of species bacteria were be used, Escherichia coli, Pseudomonas fluorescens, and Thiobacillus ferrooxidans. The result showed the corrosion rate on API 5L steel without bacteria was 2.7558 mpy, but it reached 3.4273, 3.6062 and 3.7699 mpy after addition with E. coli, P. fluorescens, and T. ferrooxidans, respectively. It was indicating that bacteria can accelerate the corrosion rate. The highest bio-corrosion rate due to T. ferrooxidans without heat treatment process was 3.7699 mpy. Meanwhile, the bio-corrosion rate due to T. ferrooxidans with austempering process was 3.5046 mpy. It was indicating that heat treatment can decrease the bio-corrosion rate.

Download Full-text

Effects of Surface Roughness on the Electrochemical Properties and Galvanic Corrosion Behavior of CFRP and SPCC Alloy

Materials ◽

10.3390/ma13184211 ◽

2020 ◽

Vol 13 (18) ◽

pp. 4211

Author(s):

YoungHwan Kim ◽

MyeongHan Yoo ◽

MinSeok Moon

Keyword(s):

Surface Roughness ◽

Corrosion Rate ◽

Corrosion Behavior ◽

Corrosion Test ◽

Surface Composition ◽

Galvanic Corrosion ◽

Reinforced Plastic ◽

Electrode Cell ◽

Before And After ◽

Compositional Changes

This study investigated the potentiodynamic corrosion behavior of carbon fiber reinforced plastic (CFRP) and automotive rolled mild steel alloy (SPCC alloy) under different surface roughness conditions. Electrochemical characterization was performed using a potentiodynamic corrosion test with 5.0 wt.% NaCl aqueous solution at 25 ± 2 °C, while microstructural and compositional changes before and after corrosion were evaluated using field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS), respectively. The CFRP and SPCC corrosion rate increased as surface roughness increased. Generally, SPCC corroded faster than CFRP. The surface composition of CFRP was not affected by corrosion, regardless of the surface roughness conditions. Conversely, SPCC exhibited remarkable changes due to the formation of oxides, and its corrosion was more severe than that of CFRP as surface roughness increased. We used a double flat electrode cell to conduct a galvanic corrosion test in this study at 25 ± 2 °C. In this galvanic corrosion test, we studied different kinds of surface roughness for SPCC specimens under the CFRP material in its as-received condition and #200 condition. We confirmed that the results of galvanic corrosion for this study have a difference in corrosion amount and corrosion rate of SPCC specimens according to the surface roughness of CFRP.

Download Full-text

Microstructural and Corrosion Behavior of Biodegradable Magnesium Alloys for Biomedical Implant

Materials Science Forum ◽

10.4028/www.scientific.net/msf.819.331 ◽

2015 ◽

Vol 819 ◽

pp. 331-336

Author(s):

H.Y. Tok ◽

Esah Hamzah ◽

Hamid Reza Bakhsheshi-Rad

Keyword(s):

Corrosion Rate ◽

Corrosion Behavior ◽

Microstructural Analysis ◽

Corrosion Current ◽

Immersion Test ◽

Ternary Alloys ◽

Corrosion Properties ◽

X Ray ◽

Electrochemical Tests ◽

Production Of Hydrogen

Magnesium and its alloys have great potential as biodegradable metallic implant materials with good mechanical properties. However, the poor corrosion rate and the production of hydrogen during degradation hindered its application. Binary alloy, Mg-3Ca and ternary alloy, Mg-3Ca-3Zn alloy were studied to investigate their bio-corrosion properties. Microstructure evolution and surfaces of corroded alloys were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The bio-corrosion behavior of the Mg alloys was investigated using immersion and electrochemical tests in Kokubo solution. Microstructural analysis showed that binary Mg-3Ca alloy consisted of α-Mg and Mg2Ca phases and ternary Mg-3Ca-3Zn alloy consisted of α-Mg, Ca2Mg6Zn3 and Mg2Ca phases. These phases had significant effect on the corrosion resistant of the alloy. Electrochemical test showed an improvement in ternary alloys where the corrosion current density reduced from 0.497 mA/cm2 in Mg-3Ca to 0.312 mA/cm2 in Mg-3Ca-3Zn alloy. Ternary Mg-3Ca-3Zn showed significant lower corrosion rate (1.1 mg/cm2/day) compared to binary Mg-3Ca (5.8 mg/cm2/day) alloy after 14 days immersion test.

Download Full-text

The effect of strain amount on corrosion behavior of EDDQ steel sheet

Koroze a ochrana materialu ◽

10.1515/kom-2016-0020 ◽

2016 ◽

Vol 60 (4) ◽

pp. 128-131

Author(s):

J. Brezinová ◽

J. Slota ◽

M. Tomáš ◽

J. Koncz

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Corrosion Rate ◽

Corrosion Behavior ◽

Steel Sheet ◽

Electrochemical Impedance ◽

Experimental Studies ◽

Corrosion Monitoring ◽

Corrosion Properties ◽

Modern Methods

Abstract This paper presents the results of research aimed to measuring the corrosion properties of EDDQ steel sheet. The strain amount influence to the corrosion properties of the steel sheet for drawn parts has been proven by the modern methods of corrosion monitoring such as Electrochemical Impedance Spectroscopy. Corrosion rate was assessed using electrochemical methods in 0.1 M solution of NaCl. Experimental studies have pointed out if strain amount increases the corrosion rate of the steel sheet increases too.

Download Full-text

New Corrosion Test Method for Improved Performance Ladle Purge Plug

AISTech2020 Proceedings of the Iron and Steel Technology Conference ◽

10.33313/380/082 ◽

2020 ◽

Author(s):

P. Hunger ◽

Q. Robinson

Keyword(s):

Corrosion Test ◽

Test Method ◽

Improved Performance

Download Full-text

Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Coatings ◽

10.3390/coatings11050517 ◽

2021 ◽

Vol 11 (5) ◽

pp. 517

Author(s):

Bin Sun ◽

Lei Cheng ◽

Chong-Yang Du ◽

Jing-Ke Zhang ◽

Yong-Quan He ◽

...

Keyword(s):

Corrosion Resistance ◽

Oxide Scale ◽

Corrosion Product ◽

Corrosion Behavior ◽

Corrosion Test ◽

Atmospheric Corrosion ◽

Corrosion Mechanism ◽

Type I ◽

Rust Layer ◽

Hot Rolled

The atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples after 80 cycles of the wet–dry corrosion test showed that scale comprised wüstite and magnetite had strongest corrosion resistance. Oxide scale composed of inner magnetite/iron (>70%) and an outer magnetite layer had the weakest corrosion resistance. The corrosion kinetics (weight gain) of each type of oxide scale followed an initial linear and then parabolic (at middle to late corrosion) relationship. This could be predicted by a simple kinetic model which showed good agreement with the experimental results. Analysis of the potentiometric polarization curves, obtained from oxide coated steel electrodes, revealed that the type I oxide scale had the highest porosity, and the corrosion mechanism resulted from the joint effects of electrochemical behavior and the porosity of the oxide scale. In the initial stage of corrosion, the corrosion product nucleated and an outer rust layer formed. As the thickness of outer rust layer increased, the corrosion product developed on the scale defects. An inner rust layer then formed in the localized pits as crack growth of the scale. This attacked the scale and expanded into the substrate during the later stage of corrosion. At this stage, the protective effect of the oxide scale was lost.

Download Full-text