scholarly journals Localized Corrosion Resistance on Additively Manufactured Ti Alloys by Means of Electrochemical Critical Localized Corrosion Potential in Biomedical Solution Environments

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7481
Author(s):  
Dong-Il Seo ◽  
Jae-Bong Lee
Keyword(s):  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Passive Film ◽  
Human Body ◽  
Corrosion Potential ◽  
New Method ◽  
Localized Corrosion ◽  
Ti Alloys ◽  
Corrosive Environments ◽  
Repassivation Kinetics

This study proposes a new method, electrochemical critical localized corrosion potential (E-CLCP), in order to evaluate localized corrosion resistance of biomedical additive manufacturing (AM) titanium (Ti) alloys. The procedures for determining E-CLCP are completely different from that of the electrochemical critically localized corrosion temperature (E-CLCT) method (ISO 22910:2020). However, its application should be limited to pH and temperature of the human body because of the temperature scan. E-CLCP displays the localized corrosion resistance of AM Ti alloys based on the human body’s repassivation kinetics, whereas E-CLCT displays the localized corrosion resistance of the alloys based on passive film breakdown in much harsher corrosive environments.

scholarly journals The Confocal Scanning Laser Microscopic Study of the Pitting Corrosion on Sputter-Deposited W-Ti Alloys in 1 M NaOH Solution

1970 ◽  
Vol 26 (1) ◽  
pp. 17-26
Author(s):  
Jagadeesh Bhattarai
Keyword(s):  
Passive Film ◽  
Pitting Corrosion ◽  
Corrosion Potential ◽  
Open Circuit ◽  
Scanning Laser ◽  
Ti Alloys ◽  
Naoh Solution ◽  
Confocal Scanning ◽  
Confocal Scanning Laser ◽  
Sputter Deposited

The pitting corrosion of the passive films formed on the surface of sputter-deposited W-30Ti and W-53Ti alloys after immersion for 24 hours in alkaline 1 M NaOH soution at 25°C was studied by using the surface sensitive technique of the confocal scanning laser microscopic (CSLM) technique including corrosion tests and electrochemical measurements. The higher corrosion rate of the W-30Ti alloy (i.e., about 3x 10-2 mm/y) than those of the W-53Ti and W-90Ti alloys (i.e., about 4-5 x 10-3 mm/y) was mostly due to the deep type of pitting corrosion observed on the surface of the passive film formed on the W-30Ti alloy in 1 M NaOH solution. The shallow type of pits was developed on the surface of the passive film formed on the W-53Ti alloy, whereas no pitting corrosion on the titanium-rich W-90Ti alloy.Keywords: Pitting corrosion; Open circuit corrosion potential; Corrosion test; CSLM studyTribhuvan University Journal Vol. XXVI, No. 1, 2009 Page: 17-26

HASTELLOY C-2000 ALLOY

Alloy Digest ◽  
1996 ◽  
Vol 45 (9) ◽  
Keyword(s):  
Thermal Stability ◽  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Nitric Acid ◽  
Hydrochloric Acid ◽  
High Resistance ◽  
Localized Corrosion ◽  
Good Thermal Stability ◽  
High Concentrations ◽  
Corrosive Environments

Abstract Hastelloy C-2000 has a broad capability range for handling corrosive environments. The alloy has high resistance to reagent grade sulfuric acid, hydrochloric acid to high concentrations, and nitric acid. The alloy has outstanding localized corrosion resistance, excellent stress-corrosion cracking resistance, and good thermal stability. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance. Filing Code: Ni-516. Producer or source: Haynes International Inc.

scholarly journals Optimization of AZ91D Process and Corrosion Resistance Using Wire Arc Additive Manufacturing

2018 ◽  
Vol 8 (8) ◽  
pp. 1306 ◽  
Author(s):  
Seungkyu Han ◽  
Matthew Zielewski ◽  
David Martinez Holguin ◽  
Monica Michel Parra ◽  
Namsoo Kim
Keyword(s):  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Human Body ◽  
Structural Integrity ◽  
Material Selection ◽  
Essential Element ◽  
The Body ◽  
Corrosion Rates ◽  
Wire Arc Additive Manufacturing

Progress on Additive Manufacturing (AM) techniques focusing on ceramics and polymers evolves, as metals continue to be a challenging material to manipulate when fabricating products. Current methods, such as Selective Laser Sintering (SLS) and Electron Beam Melting (EBM), face many intrinsic limitations due to the nature of their processes. Material selection, elevated cost, and low deposition rates are some of the barriers to consider when one of these methods is to be used for the fabrication of engineering products. The research presented demonstrates the use of a Wire and Arc Additive Manufacturing (WAAM) system for the creation of metallic specimens. This project explored the feasibility of fabricating elements made from magnesium alloys with the potential to be used in biomedical applications. It is known that the elastic modulus of magnesium closely approximates that of natural bone than other metals. Thus, stress shielding phenomena can be reduced. Furthermore, the decomposition of magnesium shows no harm inside the human body since it is an essential element in the body and its decomposition products can be easily excreted through the urine. By alloying magnesium with aluminum and zinc, or rare earths such as yttrium, neodymium, cerium, and dysprosium, the structural integrity of specimens inside the human body can be assured. However, the in vivo corrosion rates of these products can be accelerated by the presence of impurities, voids, or segregation created during the manufacturing process. Fast corrosion rates would produce improper healing, which, in turn, involve subsequent surgical intervention. However, in this study, it has been proven that magnesium alloy AZ91D produced by WAAM has higher corrosion resistance than the cast AZ91D. Due to its structure, which has porosity or cracking only at the surface of the individual printed lines, the central sections present a void-less structure composed by an HCP magnesium matrix and a high density of well dispersed aluminum-zinc rich precipitates. Also, specimens created under different conditions have been analyzed in the macroscale and microscale to determine the parameters that yield the best visual and microstructural results.

Corrosion Behaviors for Galvanizing, Galvalume and Chromate Treated Steels in 1% NaOH Solution

2017 ◽  
Vol 744 ◽  
pp. 217-222 ◽  
Author(s):  
Kyung Man Moon ◽  
Sung Yul Lee ◽  
Jae Hyun Jeong ◽  
Myeong Hoon Lee
Keyword(s):  
Corrosion Resistance ◽  
Rapid Development ◽  
Steel Structures ◽  
Galvanized Steel ◽  
Localized Corrosion ◽  
Industrial Society ◽  
General Corrosion ◽  
Naoh Solution ◽  
Corrosive Environments ◽  
Chromate Treatment

The galvanized steel structures may be inevitably corroded rapidly in the case of exposed to corrosive environments for long time, and these corrosive environments has been accelerated with increasing the environmental contamination due to the rapid development of industrial society. However, since the galvanizing method have the various merits compared to surface coating treatment in economical point of view, the galvanized steel have been extensively used to the numerous constructional steels such as a guard rail of high way, various types of structural steel for manufacturing ship and various industrial fields etc.. Therefore, it has been made an effort to improve the corrosion resistance of the galvanizing film through various methods such as variation of chemical composition of galvanizing bath, chromate treatment and coating treatment etc.. In this study, comparison evaluation on the corrosion resistance of three types of the test specimens, that is, three samples of pure galvanizing, galvalume and chromate treatment were investigated using electrochemical methods in 1% NaOH solution. The samples of chromate treatment and of galvalume exhibited the lowest and highest corrosion current density respectively in 1% NaOHsolution. In addition, the sample of chromate treatment revealed the highest impedance at 0.01Hz, which is considered that the oxide film by chromate treatment is deposited on the surface of pure galvanizing sample. After drawing polarization curves, the corroded surface of the pure galvanizing specimen indicated pattern like as localized corrosion, moreover, the large amount of corrosive products was observed on the surface of galvalume sample. However, the smooth pattern nearly similar to general corrosion was observed at the corroded surface of the sample of chromate treatment. Consequently, it is considered that the chromate treatment is an optimum method compared to pure galvanizing and, galvalume treatment to improve corrosion resistance in 1% NaOH solution.

Corrosion and related mechanical properties of bulk metallic glasses

2007 ◽  
Vol 22 (2) ◽  
pp. 302-313 ◽  
Author(s):  
John R. Scully ◽  
A. Gebert ◽  
Joe H. Payer
Keyword(s):  
Corrosion Resistance ◽  
Passive Film ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Three Dimensional ◽  
Protective Layer ◽  
Design Guidelines ◽  
Localized Corrosion ◽  
Hydrogen Damage ◽  
Superior Corrosion Resistance

The review of corrosion performance of a number of alloy systems documents several metallic glasses with corrosion resistance superior to that of crystalline metals. In other cases, the metallic glasses do not have superior corrosion resistance. The nature of corrosion resistance of the metallic glasses is often directly related to the development of a passive film (protective layer) on the reactive alloy substrate, increased durability of the passive film, or enhanced resistance to localized corrosion where the passive film is broken or damaged. Potential mechanical/environmental degradation processes include stress-corrosion cracking, corrosion fatigue, various forms of hydrogen damage, wear, and abrasion. The availability of bulk metallic glasses in significant three-dimensional sizes will stimulate important work in these areas that will enhance the fundamental understanding of the corrosion behavior and mechanical interactions and develop design guidelines and materials properties database for designers and engineers.

Effect of temperature on the crevice corrosion resistance of Ni-Cr-Mo alloys as engineered barriers in nuclear waste repositories

2012 ◽  
Vol 1475 ◽  
Author(s):  
Edgar C. Hornus ◽  
C. Mabel Giordano ◽  
Martín A. Rodríguez ◽  
Ricardo M. Carranza
Keyword(s):  
Corrosion Resistance ◽  
Crevice Corrosion ◽  
Chloride Concentration ◽  
Localized Corrosion ◽  
Effect Of Temperature ◽  
Corrosion Susceptibility ◽  
Engineered Barriers ◽  
Corrosive Environments ◽  
Waste Repositories

ABSTRACTNi-Cr-Mo alloys offer an outstanding corrosion resistance in a wide variety of highly corrosive environments. Alloys 625, C-22, C-22HS and HYBRID-BC1 are considered among candidates as engineered barriers of nuclear repositories. The objective of the present work was to assess the effect of temperature on the crevice corrosion resistance of these alloys. The crevice corrosion repassivation potential (ER,CREV) of the tested alloys was determined by the Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD) method. Alloy HYBRID-BC1 was the most resistant to chloride-induced crevice corrosion, followed by alloys C-22HS, C-22 and 625. ER,CREV showed a linear decrease with temperature. There is a temperature above which ER,CREV does not decrease anymore, reaching a minimum value. This ER,CREV value is a strong parameter for assessing the localized corrosion susceptibility of a material in a long term timescale, since it is independent of temperature, chloride concentration and geometrical variables such as crevicing mechanism, crevice gap and type of crevice former.

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