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

Materials ◽  
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.

scholarly journals Effect of Ultrasonic Surface Rolling Treatment on Corrosion Behavior of Alloy 690

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 917 ◽  
Author(s):  
Jiang Liu ◽  
Junbiao Liu ◽  
Xuehui Zhang ◽  
Tahir Ahmad ◽  
Tongxiang Liang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Layer ◽  
Corrosion Behavior ◽  
Electrochemical Corrosion ◽  
Coarse Grained ◽  
Alloy 690 ◽  
Average Grain Size ◽  
Before And After ◽  
Immersion Experiment ◽  
Secondary Side

The nanograins (NG) on the top surface layer of alloy 690 were successfully prepared by ultrasonic surface rolling treatment (USRT). The average grain size of NG alloy 690 was 55 nm, and the thickness of the NG surface layer was about 1 μm. Meanwhile, the surface roughness was significantly reduced after surface nanocrystalliztion. The corrosion behavior of alloy 690 before and after USRT was studied in a secondary side environment containing chloride. Electrochemical corrosion experiments demonstrated that the passive film generated by USRT was denser than that formed on coarse-grained (CG) alloy 690. Pitting corrosion was prone to occur in grain boundaries of CG alloy 690, and the pits on the surface of NG alloy 690 were smaller than those generated on CG alloy 690 after 1000 h of an immersion experiment.

Influences of Zinc Content and Solution Heat Treatment on Microstructure and Corrosion Behavior of Mg-Zn Binary Alloys

CORROSION ◽  
10.5006/3672 ◽  
2020 ◽  
Author(s):  
Dinh Pham ◽  
Sachiko Hiromoto ◽  
Equo Kobayashi
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Volume Fraction ◽  
Galvanic Corrosion ◽  
Zinc Content ◽  
Eutectic Cell ◽  
Zn Content ◽  
Cast Alloys

The influences of Zn content and heat treatment on microstructure and corrosion behavior of Mg-xZn (x=1, 3, 5 and 7 wt.%) alloys were studied. (α-Mg + MgZn) eutectic cells and Zn-segregated regions were formed in the as-cast alloys. The Zn-rich phases acted as micro-cathodes in galvanic corrosion. Volume fraction of the Zn-rich phases increased with Zn content of the as-cast alloys, leading to a decrease in corrosion resistance. The corrosion rate of the as-cast alloys increased by 4 times with an increase of the volume fraction of eutectic cell from 0.07 vol.% of Mg-1Zn alloy to 2.18 vol.% of Mg-5Zn alloy. The corrosion rate of Mg-7Zn alloy with 2.87 vol% eutectic cells was 2 times higher than that of Mg-5Zn alloy. The Zn-rich phases dissolved by the T4 treatment and only the T4-treated Mg-7Zn alloy obviously showed eutectic cells of 1.73 vol.%. The polarization resistance (Rp) of the T4-treated Mg-1, 3 and 5Zn alloys was 2-10 times higher than that of the as-cast alloys. The T4-treated Mg-7Zn showed similar Rp to the as-cast Mg-5Zn alloy. Consequently, the volume fraction of Zn-rich phases dominated the corrosion resistance of Mg-xZn alloys.

Corrosion Behavior and Mechanical Properties of Reinforcing Bar HRB400 in NaCl Solution

2011 ◽  
Vol 418-420 ◽  
pp. 451-454
Author(s):  
Li Ping ◽  
Wang Ying
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Reinforcing Bar ◽  
Corrosion Scale ◽  
Before And After ◽  
Concrete Solution

The corrosion behavior of reinforcing bar HRB400 in simulated concrete solution (0.5 wt.% NaCl solution) was investigated, and its tensile mechanical properties were tested before and after corrosion. The results show that, with the increase of corrosion time from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, and the composition amounts of corrosion scale are similar. After 720h, the yield strength and tensile strength are decreased by less than 10%, and the elongation are decreased by more than 20%.

scholarly journals Experimental Investigation of the Corrosion Behavior of Friction Stir Welded AZ61A Magnesium Alloy Welds under Salt Spray Corrosion Test and Galvanic Corrosion Test Using Response Surface Methodology

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
A. Dhanapal ◽  
S. Rajendra Boopathy ◽  
V. Balasubramanian ◽  
K. Chidambaram ◽  
A. R. Thoheer Zaman
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Ph Value ◽  
Galvanic Corrosion ◽  
Salt Spray ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Salt Spray Corrosion ◽  
Friction Stir

Extruded Mg alloy plates of 6 mm thick of AZ61A grade were butt welded using advanced welding process and friction stir welding (FSW) processes. The specimens were exposed to salt spray conditions and immersion conditions to characterize their corrosion rates on the effect of pH value, chloride ion concentration, and corrosion time. In addition, an attempt was made to develop an empirical relationship to predict the corrosion rate of FSW welds in salt spray corrosion test and galvanic corrosion test using design of experiments. The corrosion morphology and the pit morphology were analyzed by optical microscopy, and the corrosion products were examined using scanning electron microscope and X-ray diffraction analysis. From this research work, it is found that, in both corrosion tests, the corrosion rate decreases with the increase in pH value, the decrease in chloride ion concentration, and a higher corrosion time. The results show the usage of the magnesium alloy for best environments and suitable applications from the aforementioned conditions. Also, it is found that AZ61A magnesium alloy welds possess low-corrosion rate and higher-corrosion resistance in the galvanic corrosion test than in the salt spray corrosion test.

scholarly journals Corrosion Behavior of L245N Standard Steel in CO2 Saturated Brine under Flow Condition

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 880
Author(s):  
Ying Hu ◽  
Long Xin ◽  
Tingguang Liu ◽  
Yonghao Lu
Keyword(s):  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Galvanic Corrosion ◽  
Morphological Characteristics ◽  
X Ray Diffraction ◽  
Slow Increase ◽  
Corrosion Scale ◽  
The One ◽  
Standard Steel

The corrosion behavior of oilfield used L245N standard steel was tested in simulated oilfield solution by dynamic high-temperature autoclave. The corrosion products were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Electrochemical impedance spectroscopy (EIS) respectively. In addition, the corrosion rates and surface morphological characteristics of the steels after different exposure times were studied. The results showed that the corrosion rate decreased sharply and then increased with time in the high salinity flow solution, which was related to the formation of corrosion scale and the remaining cementite within it. At the beginning of the exposure time, the formed corrosion scale became thicker, resulting in a significant decrease of the corrosion rate. While with increasing time, on the one hand, the increased remaining cementite within corrosion scale facilitated the corrosion by the galvanic corrosion between the remaining cementite and the ferrite within the metal. On the other hand, the protective effect of corrosion scale formed on the remaining cementite skeleton declined due to the formation of large amounts of FexCa1−xCO3, which also promoted the corrosion rate of the steels, both these ways contributed to a slow increase of corrosion rate.

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

2015 ◽  
Vol 754-755 ◽  
pp. 998-1001 ◽  
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.

Study on Mechanical Properties of Rebar HRB400 after Corrosion

2014 ◽  
Vol 908 ◽  
pp. 115-118
Author(s):  
Ping Li ◽  
Ying Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Before And After ◽  
Corrosion Time

The corrosion behavior of rebar HRB400 in 1.5 wt.% NaCl solution was studied, and the mechanical properties before and after corrosion were tested. The results showed that, with the increase of corrosion time from 240h to 720h, the corrosion rate of rebar HRB400 increases and the corrosion becomes heavier. Meanwhile, the yield strength and tensile strength decrease, but the elongation decreases at first and then increases.

Corrosion Behavior of Reinforcing Steel Bar HPB235 in NaCl Solution

2011 ◽  
Vol 287-290 ◽  
pp. 738-741 ◽  
Author(s):  
Ying Wang ◽  
Ping Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Reinforcing Steel ◽  
Nacl Solution ◽  
Corrosion Scale ◽  
Steel Bar ◽  
Before And After

The corrosion behavior of reinforcing steel bar HPB235 in concrete structure in 0.5% NaCl solution was investigated and its mechanical properties were tested before and after corrosion. The results showed that, with corrosion time increasing from 240h to 720h, the corrosion rate increases and the corrosion becomes heavier and heavier, but the corrosion scale is not changed obviously in compositions. After 720h, the yield strength is decreased by less than 5%, but the tensile strength and the elongation are decreased by more than 10%.

Heat Treatment of SS 316L for Automotive Applications

2020 ◽  
Vol 1010 ◽  
pp. 28-33
Author(s):  
Nur Maizatul Shima Adzali ◽  
Noor Aaizaa Azhar ◽  
Zuraidawani Che Daud ◽  
Nur Hidayah Ahmad Zaidi ◽  
Sinar Arzuria Adnan
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Experimental Result ◽  
Low Carbon ◽  
Automotive Applications ◽  
Muffle Furnace ◽  
Untreated Sample ◽  
Before And After

Stainless steel 316L (SS 316L) is a low carbon-chromium-nickel-molybdenum austenitic stainless steel. Its application in automotive industry include as exhaust housings for catalytic converters and turbocharger. In this research, the tempering heat treatment was conducted by using SS 316L samples. These steels were austenitized at 860°C for 1 hours before doing two tempering process. Austempering was conducted at 360°C for 15 min in the muffle furnace then air cooled while martempering was conducted at 160°C for 15 min in a muffle furnace then quench in water. The corrosion test was carried out using 1.0 M oxalic acid solution for 30 days in room temperature. Hardness test and microstructural observation were carried out for SS 316L before and after corrosion test. Experimental result showed that untreated sample have highest hardness value before and after corrosion test which were 232 HV and 225 HV respectively. The hardness value before corrosion test is 199.7 HV for austempered sample, and 201.3 HV for martempered sample. Untreated sample shows the lowest corrosion rate (0.94×10-3 mpy), followed by austempered sample (1.89x10-3 mpy) and the highest corrosion rate is for martempered sample (2.36×10-3 mpy). After corrosion, under optical microscope observation, martempered steel has more pits than austempered steel. In summary, austempering is the best heat treatment for SS 316L in automotive applications that give high ductility and toughness after heat treatment with high corrosion resistance.

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