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

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.

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

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.

Effect of Sulfuric Acid Concentration on the Corrosion Rate of ASTM A213-T12 Steel

2020 ◽  
Vol 867 ◽  
pp. 213-217
Author(s):  
Suwarno ◽  
Muhammad Nashir
Keyword(s):  
Sulfuric Acid ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Sulfuric Acid Concentration ◽  
Solution Concentration ◽  
Immersion Test ◽  
Corrosion Properties ◽  
Acid Molarity ◽  
Mechanical And Corrosion Properties ◽  
Corrosion Of Steel

Even though carbon steel is susceptible to corrosion degradation, carbon steel is widely used for applications in the industry. Impurities in steel composition are known to affect the mechanical and corrosion properties. There are many studies on the corrosion of steel, but for a specific application, further research still required. The present work is conducted to determine the effect of low concentration of sulfuric acid on the corrosion rate of power plant steel ASTM A213-T12 with a solution concentration from 0.01-0.05 M H2SO4. The corrosion rate was determined by using an immersion test as well as a polarization method using a potentiostat. The result shows that increasing the concentration of sulfuric acid molarity, the corrosion rate tended to increase. Furthermore, the effect of phosphor contents significantly affects the corrosion rate in which steel with high phosphor contents has a high corrosion rate.

Investigation of time-dependent corrosion behavior of Sr-modified AlSi12 alloy

2020 ◽  
Vol 111 (4) ◽  
pp. 339-346
Author(s):  
Gökçe Hapçı Aǧaoǧlu ◽  
İnal Kaan Duygun ◽  
Gökhan Orhan
Keyword(s):  
Particle Size ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Immersion Time ◽  
Volume Fraction ◽  
Electrochemical Impedance ◽  
Eutectic Structure ◽  
Time Dependent ◽  
Corrosion Properties

Abstract The effect of Sr addition on the microstructure and time-dependent corrosion properties of the AlSi12 eutectic alloy was investigated. The modified alloy contained 90 ± 3 ppm Sr. The microstructural differences in the eutectic structure of AlSi12 alloys were assessed in terms of the Si particle size and a-Al volume fraction. The unmodified and Sr-modified alloys were immersed for 1, 24, 72 and 120 h in 3.5 wt.% NaCl. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were performed to analyze the corrosion characteristics of the alloys. Sr addition led to a decrease in the Si particle size, and the formation of long dendritic a-Al. It was found that the presence of Sr resulted in more stable corrosion behavior up to 24 h. The deterioration of the corrosion behavior of Sr-modified alloy was observed with the further increase of immersion time.

Microstructure and Corrosion Behavior of Hot Compressed AZ31B Magnesium Alloy Joint

2016 ◽  
Vol 849 ◽  
pp. 121-127
Author(s):  
Ya Jie Chu ◽  
Xin Chen Han ◽  
Zong Hui Yang ◽  
Xiao Quan Li
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Immersion Time ◽  
Chloride Ion ◽  
Immersion Test ◽  
Ion Concentration ◽  
Corrosion Morphology ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc

The extruded AZ31B magnesium alloy plates of 4 mm thickness were butt welded using gas tungsten arc welding (GTA) process. The microstructure and corrosion behavior of the hot compressed welds were evaluated by conducting immersion test in NaCl solution at different immersion time and chloride ion concentrations. The specimens were exposed to immersion in order to characterize their corrosion rates. The corrosion morphology and pit morphology observation was carried out by scanning electron microscopy (SEM). The results showed that the corrosion rate of hot compressed magnesium alloy welds decreased with the increase in immersion time and the corrosion rate increased with the increase in chloride ion concentration, and the corrosion morphology was predominantly influenced by the distribution of β-phase.

scholarly journals Effect of Heat Treatment on the Mechanical and Corrosion Properties of Mg–Zn–Ga Biodegradable Mg Alloys

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7847
Author(s):  
Viacheslav Bazhenov ◽  
Anastasia Lyskovich ◽  
Anna Li ◽  
Vasily Bautin ◽  
Alexander Komissarov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Rate ◽  
Orthopedic Implants ◽  
Mg Alloys ◽  
Medical Implants ◽  
Corrosion Properties ◽  
Treatment Regimens ◽  
Mechanical And Corrosion Properties ◽  
Potential Use

Mg alloys have mechanical properties similar to those of human bones, and have been studied extensively because of their potential use in biodegradable medical implants. In this study, the influence of different heat treatment regimens on the microstructure and mechanical and corrosion properties of biodegradable Mg–Zn–Ga alloys was investigated, because Ga is effective in the treatment of disorders associated with accelerated bone loss. Solid–solution heat treatment (SSHT) enhanced the mechanical properties of these alloys, and a low corrosion rate in Hanks’ solution was achieved because of the decrease in the cathodic-phase content after SSHT. Thus, the Mg–4 wt.% Zn–4 wt.% Ga–0.5 wt.% Y alloy after 18 h of SSHT at 350 °C (ultimate tensile strength: 207 MPa; yield strength: 97 MPa; elongation at fracture: 7.5%; corrosion rate: 0.27 mm/year) was recommended for low-loaded orthopedic implants.

THE EFFECT OF PLASMA OXIDATION AND NITRIDATION ON CORROSION BEHAVIOR OF CoCrMo ALLOY IN SBF SOLUTION

2018 ◽  
Vol 25 (08) ◽  
pp. 1950024
Author(s):  
M. ASLAN ◽  
O. ÇOMAKLI ◽  
M. YAZICI ◽  
A. F. YETIM ◽  
Ö. BAYRAK ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Plasma Nitriding ◽  
Simulated Body Fluid Solution ◽  
Process Temperature ◽  
Plasma Oxidation ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
Sbf Solution

The present study was focussed on investigating the corrosion properties of plasma-oxidized and -nitrided CoCrMo alloys under different conditions. The structural properties of untreated and treated samples were examined by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Corrosion behavior of samples was mainly investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in simulated body fluid solution. The results showed that corrosion resistance of the oxidized layers was better than that of the nitrided ones. The corrosion resistance of the alloys increased as the plasma oxidation process temperature and time increased. However, the corrosion resistance of the alloys reduced with increase in the process temperature and time after plasma nitriding process.

Corrosion Behaviour of Automotive Steel Sheets Depending on the Degree of Deformation

2014 ◽  
Vol 635 ◽  
pp. 57-60 ◽  
Author(s):  
Janette Brezinová ◽  
Juraj Koncz ◽  
Miroslav Tomáš ◽  
Ján Slota
Keyword(s):  
Corrosion Rate ◽  
Steel Sheet ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Experimental Studies ◽  
Corrosion Monitoring ◽  
Corrosion Properties ◽  
Degree Of Deformation ◽  
Steel Sheets ◽  
Automotive Steel

This paper presents the results of research aimed to measuring the corrosion properties of automotive steel sheets. The degree of deformation influence to the corrosion properties of the steel sheet for car body 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 degree of deformation increases the corrosion rate of the steel sheet increases as well.

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

2020 ◽  
Vol 867 ◽  
pp. 8-16
Author(s):  
Miftakhur Rohmah ◽  
Moch. Syaiful Anwar ◽  
Rahadian Roberto ◽  
Fatayalkadri Citrawati
Keyword(s):  
Corrosion Rate ◽  
Cold Rolling ◽  
Corrosion Behavior ◽  
Corrosion Test ◽  
Test Method ◽  
Railway Track ◽  
Air Cooling ◽  
Corrosion Properties ◽  
Train Station ◽  
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.

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