scholarly journals Influence of Laser Treatment on the Corrosion Resistance of Cr3C2-25(Ni20Cr) Cermet Coating

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4078
Author(s):  
Mieczyslaw Scendo ◽  
Wojciech Zorawski ◽  
Katarzyna Staszewska-Samson ◽  
Anna Goral
Keyword(s):  
Corrosion Resistance ◽  
Laser Treatment ◽  
Electrochemical Method ◽  
Laser Spot ◽  
Laser Remelting ◽  
Corrosion Properties ◽  
Cermet Coatings ◽  
Cermet Coating ◽  
Acidic Chloride Solution ◽  
Acidic Chloride

The influence of the laser treatment on the corrosion resistance of the Cr3C2-25(Ni20Cr) cermet coating on the Al7075 (EN, AW-7075) substrate (Cr3C2-25(Ni20Cr)/Al7075) was investigated. The coating was produced by the cold sprayed (CS) method. The tested coatings were irradiated with a laser spot speed of 600 mm/min, 800 mm/min, and 1000 mm/min. The mechanical properties of the Cr3C2-25(Ni20Cr)/Al7075 were characterized by microhardness (HV) measurements. The surface and microstructure of the specimens were observed by ascanning electron microscope (SEM) and other assistive techniques. The corrosion test of materials wascarried out by using the electrochemical method in the acidic chloride solution. Cermet coatings perfectly protect the Al7075 substrate against contact with an aggressive corrosion environment. The laser remelting process of the Cr3C2-25(Ni20Cr) layer caused the homogenization of the structure cermet coatings. The irradiation with the laser beam eliminates microcracks and pores on the Cr3C2-25(Ni20Cr) surface. However, the best effect of improving the anti-corrosion properties of cermet coating was obtained for the lowest laser spot speed (i.e., 600 mm/min). It was found that the corrosion rate of the Cr3C2-25(Ni20Cr) cermet coating was reduced by more than two times compared to the highest speed of the laser spot.

Effect of Co-Content on the Corrosion of High Performance Stainless Steels in Simulated Bio-Solutions

2007 ◽  
Vol 342-343 ◽  
pp. 585-588
Author(s):  
Y.R. Yoo ◽  
H.H. Cho ◽  
S.G. Jang ◽  
K.Y. Lee ◽  
H.Y. Son ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
High Performance ◽  
316L Stainless Steel ◽  
Impedance Measurement ◽  
Cytotoxicity Test ◽  
Polarization Test ◽  
Acidic Chloride Solution ◽  
Acidic Chloride ◽  
Test Result

This work focused on the effect of Co content on the corrosion resistance of high pitting resistance equivalent (PRE), super ferritic, Ni-free stainless steels in simulated biosolutions. The effect of Co in Ni-free alloys was evaluated by cytotoxicity test. Anodic polarization test and AC impedance measurement were performed to evaluate the effect of Co on corrosion resistance of the alloys. The cytotoxicity test result for 4 experimental alloys shows non-cytotoxic but mild cytotoxic for 316L stainless steel due to relatively poor corrosion resistance. However, the effect of Co on the passivity was positive in bio-solution but it was negative in acidic chloride solution.

scholarly journals Influence of Heat Treatment on the Corrosion Resistance of Aluminum-Copper Coating

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 966
Author(s):  
Mieczyslaw Scendo ◽  
Slawomir Spadlo ◽  
Katarzyna Staszewska-Samson ◽  
Piotr Mlynarczyk
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Resistance ◽  
Electrochemical Corrosion ◽  
X Ray Diffraction ◽  
Air Atmosphere ◽  
Cu Alloy ◽  
Acidic Chloride Solution ◽  
Acidic Chloride ◽  
Electrical Discharge Alloying

Influence of heat treatment on the corrosion resistance of the aluminum-copper (Al-Cu) coating on the aluminum substrate was investigated. The coating was produced by the electrical discharge alloying (EDA) method. The surface and microstructure of the specimens were observed by a scanning electron microscope (SEM). The phase analysis of the composite materials by X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) indicated that intermetallic compounds (i.e., CuAl2 and Cu9Al4) were formed through reactions between Al and Cu. during the EDA process. A significant increase in the hardness of the Al-Cu coating was affected by the improvement of the alloy structure. The heat treatment of materials was carried out at 400 °C or 600 °C in the air atmosphere. A corrosion test of materials was carried out by using electrochemical methods. The corrosive environment was acidic chloride solution. After heat treatment at 400 °C the mechanical properties of the Al/Cu alloy increased significantly and the oxide layer protect of the alloy surface against corrosion. However, after heat treatment at elevated temperature, i.e., 600 °C it was found that the (Al2O3)ads and (CuO)ads coatings were destroyed. The mechanical properties of the Al/Cu alloy decreased, and its surface has undergone deep electrochemical corrosion.

scholarly journals Analysis of corrosive properties of zinc-containing coatings based on dispersed waste hot zinc plating

2020 ◽  
pp. 106-112
Author(s):  
N. I. Urbanovich ◽  
K. E. Baranovsky ◽  
E. V. Rozenberg ◽  
T. I. Bendik ◽  
A. A. Karpenkin ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Comparative Analysis ◽  
Electrochemical Method ◽  
Salt Spray ◽  
Metallic Powder ◽  
Spray Chamber ◽  
Corrosion Properties ◽  
Protective Properties ◽  
Zinc Plating

A comparative analysis of the corrosion properties of zinc-containing coatings obtained on the basis of metallic powder zinc and dispersed hot-dip galvanized waste has been carried out. The results of a study of the corrosion resistance of zinc-containing coatings by the electrochemical method and in a salt spray chamber have shown that coatings obtained on the basis of dispersed hot-dip galvanized waste are not inferior in protective properties to coatings based on powder standard zinc.

Corrosion Resistance of Nitric Acid Passivated Cr-Ni-Mo Stainless Steel

2016 ◽  
Vol 858 ◽  
pp. 196-201
Author(s):  
Viera Zatkalíková ◽  
Lenka Markovičová
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Nitric Acid ◽  
Biomedical Applications ◽  
Electrochemical Impedance ◽  
Austenitic Stainless Steels ◽  
Mass Losses ◽  
Excellent Corrosion Resistance ◽  
Acidic Chloride Solution ◽  
Acidic Chloride

Austenitic stainless steels are considered materials with excellent corrosion resistance, and with acceptable mechanical properties. Therefore they are recommended for various constructional, industrial and biomedical applications. However they are prone to the pitting corrosion in aggressive chloride environments. The aim of this study is to evaluate the corrosion resistance of AISI 316Ti stainless steel with nitric acid passivated surface at the temperature range 22 – 80 °C in 1M acidic chloride solution. Evaluation of the corrosion resistance is based on the results of exposition immersion tests (visual and microscopic observation of attacked surfaces, mass losses of specimens) and the results of the electrochemical impedance spectroscopy (EIS) tests.

Study on Anti-Corrosion of the HAZ of 30CrMnSi Treated by Laser Remelting

2011 ◽  
Vol 291-294 ◽  
pp. 1421-1424 ◽  
Author(s):  
Yan Li Li ◽  
Ren Xu Huang ◽  
Pei Zhong Zhao ◽  
De Xian Yi
Keyword(s):  
Mechanical Properties ◽  
Laser Treatment ◽  
Heat Affected Zone ◽  
Processing Parameters ◽  
Corrosion Property ◽  
Laser Remelting ◽  
Corrosion Properties ◽  
Yag Laser ◽  
Quenched And Tempered Steel ◽  
Tempered Steel

30CrMnSi is quenched and tempered steel with medium hardenability, and good mechanical properties. However, the anti-corrosion of the weld heat affected zone will be decreased, which will lead to the worse overall properties of parts. The anti-corrosion properties of heat affected zone will be improved by YAG laser treatment according optimized processing parameters. The microstructure of the modified heat affected zone was observed and analyzed in this paper. And the anti-corrosion property was studied also. The results showed that the anti-corrosion property of heat affected zone will be improved by laser remelting technology. The laser anti-corrosion is the effective method to enhance anti-corrosion property.

scholarly journals Corrosion Behavior of Inconel 625 Coating Produced by Laser Cladding

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 759
Author(s):  
Mieczyslaw Scendo ◽  
Katarzyna Staszewska-Samson ◽  
Hubert Danielewski
Keyword(s):  
Laser Cladding ◽  
Corrosion Test ◽  
Chloride Solution ◽  
Inconel 625 ◽  
Production Technique ◽  
Corrosion Properties ◽  
Acidic Chloride Solution ◽  
Acidic Chloride ◽  
Energy Dispersive Spectroscope ◽  
Chloride Environment

Anti-corrosion properties of Inconel 625 (In) laser cladding coatings onto the (S235JR) steel (S) were investigated. The coatings were produced with the use of wire (WIn/S) or powder (PIn/S). The mechanical properties of the Inconel 625 coatings were characterized by microhardness measurements. The PIn/S shows the highest hardness. The surface and microstructure of the specimens were observed by a scanning electron microscope (SEM). The surface analysis of the laser cladding coatings by energy-dispersive spectroscope (EDS) indicated that the structure of the WIn, and PIn coatings depend on its production technique. The microstructure of the WIn and PIn coatings have a dendritic columnar character. Corrosion test materials were carried out by using electrochemical methods. The corrosive environment was acidic chloride solution. It turned out that the PIn/S coating, which was produced by laser cladding method with the use of Inconel 625 powder, has the best anti-corrosion properties in an aggressive chloride environment.

Effect of Delta Ferrite on Corrosion Resistance of Type 316L Stainless Steel in Acidic Chloride Solution by Micro-Droplet Cell

2007 ◽  
Vol 124-126 ◽  
pp. 1533-1536 ◽  
Author(s):  
Sung Yu Kim ◽  
Hyuk Sang Kwon ◽  
Hee San Kim
Keyword(s):  
Corrosion Resistance ◽  
Chloride Solution ◽  
Ferrite Phase ◽  
Potential Zone ◽  
Delta Ferrite ◽  
Polarization Behavior ◽  
Δ Ferrite ◽  
Acidic Chloride Solution ◽  
Type 316L ◽  
Acidic Chloride

More than 2% δ-ferrite phase is presented in type 316L stainless steels due to improvement of hot workability or welding process. In order to clarify the mechanism on how the δ-ferrite affects the corrosion resistance, electrochemical tests in a micro-droplet cell were conducted and microstructures were analyzed by TEM-EDS and SEM-EDS. Especially, the micro-droplet cell was modified at our laboratory to observe the polarization behavior of δ-ferrite phase in an acidic chloride solution. The anodic polarization behavior in both active zone and passive zone was affected by δ-ferrite. The degradation of corrosion resistance in the low potential zone with δ-ferrite phase is due to the preferential dissolution of a matrix, γ phase. It is explained with the fact that the formation of δ-ferrite lowers the concentrations of chromium and molybdenum in γ phase. It is also confirmed by potentiostatic test, EDS analyses and phase-equilibrium prediction. In addition, the micro-droplet cell and EDS analysis reveled that the pitting potential in the neutral pH solution was affected by Ca containing inclusion rather than δ-ferrite phase.

Corrosion Resistance of TC4 Alloy Implanted by La+, Mo+

2006 ◽  
Vol 315-316 ◽  
pp. 61-65
Author(s):  
Xiang Feng Li ◽  
Zhong Shan Wei ◽  
Dun Wen Zuo ◽  
Min Wang
Keyword(s):  
Corrosion Resistance ◽  
Ion Implantation ◽  
Surface Treatment ◽  
Chloride Solution ◽  
Chemical Activity ◽  
Opposite Result ◽  
Acidic Chloride Solution ◽  
Tc4 Alloy ◽  
Acidic Chloride ◽  
Implantation Method

The surface treatment for TC4 alloy was conducted by MEVVA ion implantation method. The corrosion resistance of TC4 alloy implanted by La+, Mo+ were measured. It were found that Mo ion implantation improved corrosion resistance of TC4 alloy in acidic chloride solution, but La ion implantation gave the opposite result because they have different chemical activity. The more implanted dose of Mo+, the more improvement of corrosion resistance.

Influence of Surface Pretreatment on the Corrosion Resistance of Cold-Sprayed Nickel Coatings in Acidic Chloride Solution

2018 ◽  
Vol 27 (4) ◽  
pp. 1725-1737 ◽  
Author(s):  
Mieczyslaw Scendo ◽  
Wojciech Zorawski ◽  
Katarzyna Staszewska-Samson ◽  
Medard Makrenek ◽  
Anna Goral
Keyword(s):  
Corrosion Resistance ◽  
Chloride Solution ◽  
Surface Pretreatment ◽  
Nickel Coatings ◽  
Acidic Chloride Solution ◽  
Acidic Chloride
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