scholarly journals Comparative Corrosion Behavior of Two Palladium-Containing Titanium Alloys

2006 ◽  
Author(s):  
Tiangan Lian ◽  
Takashi Yashiki ◽  
Takenori Nakayama ◽  
Tomoaki Nakanishi ◽  
Rau´l B. Rebak
Keyword(s):  
Titanium Alloys ◽  
Corrosion Behavior ◽  
High Strength ◽  
Yucca Mountain ◽  
Short Term ◽  
Corrosion Resistant ◽  
Electrochemical Testing ◽  
Ti Alloys ◽  
Potentiodynamic Curves ◽  
Titanium Grade

The ASTM standard B 265 provides the requirements for the chemical composition of titanium (Ti) alloys. It is planned to use corrosion resistant and high strength titanium alloys to fabricate the drip shield at the proposed Yucca Mountain Repository. Titanium grade (Gr) 7 (R52400) and other Ti alloys are currently being characterized for this application. Ti Gr 7 contains 0.15% Palladium (Pd) to increase its corrosion performance. In this article we report results on the comparative short term corrosion behavior of Ti Gr 7 and a Ruthenium (Ru) containing alloy (Ti Gr 33). Ti Gr 33 also contains a small amount of Pd. Limited electrochemical testing such as polarization resistance and cyclic potentiodynamic curves showed that both alloys have a similar corrosion behavior in the tested environments.

scholarly journals Anodic Polarization Behavior of Titanium Grade 7 in Dust Deliquescence Salt Environments

2007 ◽  
Author(s):  
Kenneth J. Evans ◽  
Raul B. Rebak
Keyword(s):  
Titanium Alloy ◽  
Crevice Corrosion ◽  
Anodic Polarization ◽  
High Strength ◽  
Yucca Mountain ◽  
Localized Corrosion ◽  
Corrosion Performance ◽  
Corrosion Resistant ◽  
Reducing Conditions ◽  
Titanium Grade

It is planned to use the highly corrosion resistant titanium grade 7 (Ti Gr 7) and a high strength titanium alloy (Ti Gr 29) to fabricate the drip shield for the Yucca Mountain repository. Ti Gr 7 contains 0.15% Palladium (Pd) to increase its corrosion performance, mainly under reducing conditions. It was important to determine the corrosion behavior of Ti Gr 7 in concentrated brines at temperatures higher than 100°C, which may represent the behavior of dust deliquescence solutions. Tests were performed in concentrated NaCl + KCl solutions containing also nitrates and fluorides. Results show that Ti Gr 7 was highly resistant to general and localized corrosion. Some specimens were polarized to potentials higher than 4 volts. None of the tightly creviced specimens suffered crevice corrosion. The presence of fluoride promoted localized corrosion around the edges of the crevice former.

Corrosion behavior of titanium alloys in acidic and saline media: role of alloy design, passivation integrity, and electrolyte modification

2020 ◽  
Vol 38 (1) ◽  
pp. 25-47 ◽  
Author(s):  
Michael O. Bodunrin ◽  
Lesley H. Chown ◽  
Josias W. van der Merwe ◽  
Kenneth K. Alaneme ◽  
Christian Oganbule ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Corrosion Behavior ◽  
Future Research ◽  
Corrosion Resistant ◽  
Factors Influencing ◽  
Ti Alloys ◽  
Service Conditions ◽  
Saline Solutions

AbstractThis paper presents an overview of the corrosion behavior of titanium (Ti) alloys in both acidic and saline solutions. The solutions covered in this review are essentially the typical electrolytes encountered by Ti alloys when applied under service conditions. Although Ti alloys are generally known to be corrosion resistant, this review identifies strong reducing acids and fluoride-containing solutions as electrolytes that corrode Ti and its alloys. The pathways that the knowledge of the corrosion behavior of Ti alloys have followed from the 1950s to date are captured in this review. Based on this, the different factors influencing the corrosion behavior of Ti alloys are highlighted and the different research concepts for improving the corrosion resistance of Ti alloys in both solutions are discussed. The limitations of these research concepts are mentioned and the directions for future research are proposed.

Current Research Situation and Development of Titanium Alloy in China in Recent Five Years

2005 ◽  
Vol 475-479 ◽  
pp. 563-568
Author(s):  
Yong Qing Zhao ◽  
Lian Zhou
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Titanium Alloys ◽  
High Strength ◽  
Basic Theory ◽  
Ti Alloys ◽  
Developing Directions ◽  
Research Situation

China pays great attentions to the development of titanium alloys and their basic theory because of their excellent properties. New titanium alloys and their new basic theories developed in China in recent five years were reviewed, for example, high temperature Ti alloys, burn resistant titanium alloys, high strength and middle strength titanium alloys and so on. The developing directions in the next 5 to 10 years were forecast.

Experimental and Modeling Studies on the Stress Relaxation Behaviour of Ti-6Al-4V Alloy

2021 ◽  
Author(s):  
Kali Prasad ◽  
Krishnaswamy Hariharan ◽  
Dilip K. Banerjee
Keyword(s):  
Stress Relaxation ◽  
Titanium Alloys ◽  
Room Temperature ◽  
Hold Time ◽  
High Strength ◽  
Uniaxial Tensile ◽  
Time Data ◽  
Transient Stress ◽  
Ti Alloys ◽  
Strain And Strain Rate

Abstract The transient mechanical behavior of materials during stress relaxation has evoked interest in manufacturing applications because of the effect of stress relaxation on formability enhancement. However, most of the previous studies have focused on advanced high strength steels and aluminum alloys. Limited transient stress relaxation studies have been conducted on titanium alloys in order to understand the influence of stress relaxation on forming behavior. Titanium alloys are widely used in aerospace components because of their high strength to weight ratios and excellent fatigue strengths. However, room temperature formability of Ti alloys is an important concern, which restricts their widespread use in various applications. To address these challenges, the present study is aimed to understand the role of transient stress relaxation on formability of Ti alloys. Toward this end, stress relaxation of a dual phase titanium alloy (Ti-6Al-4V) has been investigated experimentally. Stress relaxation tests were performed by interrupting uniaxial tensile tests in the uniform deformation regime for a pre-defined strain and hold time after which tests were continued monotonically until fracture. Single step, room temperature stress relaxation experiments were performed systematically to study the effect of hold time, pre-strain, and strain rate on mechanical properties. The stress relaxation phenomenon was found to contribute positively to the ductility improvement. The mechanisms responsible for enhancing the formability are discussed. The experimentally obtained stress vs. time data were analyzed using a advanced constitutive model for stress relaxation available in literature.

General Corrosion Behavior of N06022 in Super Concentrated Brines at Temperatures Higher than 100°C

2008 ◽  
Vol 1124 ◽  
Author(s):  
Raul B. Rebak
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Localized Corrosion ◽  
General Corrosion ◽  
Short Term ◽  
Corrosion Resistant ◽  
Electrochemical Tests ◽  
Alloy 22 ◽  
Nickel Based Alloy ◽  
Anions And Cations

AbstractAlloy 22 (N06022) is a highly corrosion resistant nickel based alloy. Extensive research has been conducted in the last eight years on the corrosion behavior of Alloy 22, mainly regarding its resistance to localized corrosion. Less attention has been paid to the general corrosion resistance in highly concentrated brines that may result from the deliquescence of salts contained in dust. Salts such as mixtures of NaCl, KCl, CaCl2, NaNO3, and KNO3 may deliquesce at temperatures above 100°C through absorption of moisture from the air. Electrochemical tests were used to assess the general corrosion behavior of Alloy 22 in brines with chloride and nitrate concentrations ranging from 8 molal to 100 molal in the temperature range 100 to 160°C. The effect of mixed anions and cations was also studied. Results show that, even for short-term immersion periods, the corrosion rate of Alloy 22 in high temperatures super concentrated brines is generally below 10 μm/year.

scholarly journals “Wear Behaviour of Titanium Alloys When Subjected to Different Speed and Load Levels”

2020 ◽  
Vol 8 (6) ◽  
pp. 5810-5814
Keyword(s):  
Titanium Alloys ◽  
Coefficient Of Friction ◽  
High Strength ◽  
Wear Behaviour ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Wear Response ◽  
Carbon Fibre Reinforced Plastic ◽  
Titanium Grade ◽  
Plastic Components

Titanium and Titanium alloys are widely used for aircraft as a material having light weight, high strength and corrosion resistance. The titanium and its alloys are compatible with carbon fibre reinforced plastic components with respect to corrosion and thermal behaviour. Response of Titanium grade 2 and grade 12 at different speed during sliding is to be studied. The literature survey shows inadequate studies on wear response of these alloys. Experiments using pin on disc test rigs were conducted. Speed level of 500rpm, 1000rpm, and 1500 rpm were used. The sliding was found to be sensitive to sliding speed. As speed increases from 500 rpm to 1000 rpm the coefficient of friction increased. At speed of 1500 rpm two steady phase of sliding identified. In one of the steady phase the coefficient of friction was found to be more than the coefficient of friction at 1000 rpm. Where in another steady phase of sliding the coefficient of friction was found to be comparable or less then the coefficient of friction at 1000 rpm

scholarly journals The Corrosion Behavior of Sputter-deposited W-Ti Alloys in 0.5 M NaCl Solution

1970 ◽  
Vol 10 ◽  
pp. 109-113 ◽  
Author(s):  
Jagadeesh Bhattarai
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Open Circuit ◽  
Nacl Solution ◽  
Corrosion Resistant ◽  
Corrosion Rates ◽  
Ti Alloys ◽  
Confocal Scanning ◽  
Confocal Scanning Laser ◽  
Sputter Deposited

The corrosion behavior of the sputter-deposited amorphous or nanocrystalline W-Ti alloys was studied in neutral 0.5 MNaCl solution at 25°C, open to air by immersion tests, electrochemical measurements and confocal scanning laser microscopic(CSLM) techniques. Titanium metal acts synergistically with tungsten in enhancing the corrosion resistance of the sputter-deposited W-Ti alloys so as to show higher corrosion resistance than those of alloy-constituting elements (that is, tungsten and titanium) in neutral 0.5 M NaCl solution. In particular, the amorphous W-Ti alloys containing 30-53 at% titanium showed lowest corrosion rates (that is, about 1 × 10-3 mm.y-1). Open circuit potentials of all the examined W-Ti alloys were shifted to more noble direction than those of the open circuit potentials of alloyconstituting elements in 0.5 M NaCl solution.Key words: Sputter deposition; W-Ti alloys; Corrosion-resistant; CSLM; NaCl solution.DOI: 10.3126/njst.v10i0.2899Nepal Journal of Science and Technology Volume 10, 2009 December Page:109-113 

Sulfide Stress Cracking Resistance of High Strength Low Alloy Steel

2012 ◽  
Vol 573-574 ◽  
pp. 1182-1186
Author(s):  
Ji Hao Cheng ◽  
Yi Qiang Sun
Keyword(s):  
Corrosion Rate ◽  
Anodic Dissolution ◽  
Corrosion Behavior ◽  
High Strength ◽  
Constant Load ◽  
Saturated Solution ◽  
Short Term ◽  
Stress Cracking ◽  
Sulfide Stress ◽  
Sulfide Stress Cracking

This paper analyzed the HSLA pipeline steel’s stress corrosion behavior and mechanism which tested in the saturated solution of H2S. The steel’s SSCC susceptibility was determined by constant load tensile according to NACE TM-0177 standard. Used SEM observed the fracture, and then the steel’s corrosion rate and short-term corrosion behavior were analyzed by electrochemical polarization curves in saturated solution of H2S in the environment A. The results show that the steel has a large SSCC susceptibility and a high corrosion rate. What’s more, corrosion rate increases with the increase of immersion time. The results also show that the crack fracture of the steel is caused by anodic dissolution and the hydrogen which penetrates into the steel can increase the anodic dissolution.

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