Crevice Corrosion - NaCl Concentration Map for Alloy 625 at Elevated Temperature

1994 ◽  
Vol 353 ◽  
Author(s):  
Toshiaki Amano ◽  
Yoichi Kojima ◽  
Shigeo Tsujikawa
Keyword(s):  
Experimental Data ◽  
Elevated Temperature ◽  
Crevice Corrosion ◽  
Elevated Temperatures ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Alloy 625 ◽  
Commercially Pure ◽  
Metal Metal ◽  
Nacl Concentration

AbstractThe repassivation potentials, Er.crev’s, for metal/metal-crevice of Alloy 625 were determined in 0.3–10% NaCl solutions for temperatures up to 250 C. The Er.crev’s were found to be the least noble at temperatures around 100 and 125 C. The Er.crev became more noble as temperature increased; this tendency was particularly strong in diluted solutions. Based on the experimental data, a crevice corrosion map showing the critical condition in terms of temperature and NaCl concentration was presented. As for the map, a wide repassivation region was found in elevated temperatures, similar to that of commercially pure titanium, C.P.Ti.

Crevice Corrosion - NaCI Concentration Map for Grade-2 Titanium at Elevated Temperature

1992 ◽  
Vol 294 ◽  
Author(s):  
Shigeo Tsujikawa ◽  
Yoichj Kojima
Keyword(s):  
Elevated Temperature ◽  
Crevice Corrosion ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Repassivation Potential ◽  
Metal Metal ◽  
Naci Concentration

ABSTRACTThe repassivation potential, ER, for metal/metal-crevice of Commercially Pure Titanium, C.P.Ti, was determined in NaC1 solutions at temperatures up to 250C. The ER has its least noble value near 100C and becomes more noble as the temperature increases. As shown in previous research[1], the shrinkage of the repassivation region should continue with increasing temperatures. However, in conducting this same experiment at temperatures higher than 100C, an examination of the NaCI concentration - temperature - crevice corrosion map verifies that the repassivation region began to expand again when the temperature exceeded 140C. This expansion continued as the temperature continued to increase.

RMI 0.2% Pd

Alloy Digest ◽  
1979 ◽  
Vol 28 (12) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Crevice Corrosion ◽  
Elevated Temperatures ◽  
Pure Titanium ◽  
Heat Treating ◽  
Low Ph ◽  
Commercially Pure Titanium ◽  
Bend Strength ◽  
Commercially Pure ◽  
Minimum Yield

Abstract RMI 0.2% Pd is a grade of commercially pure titanium to which up to 0.2% palladium has been added. It has a guaranteed minimum yield strength of 40,000 psi with good ductility and formability. It is recommended for corrosion resistance in the chemical industry and other places where the environment is mildly reducing or varies between oxidizing and reducing. The alloy has improved resistance to crevice corrosion at low pH and elevated temperatures. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-74. Producer or source: RMI Company.

Comparison of Commercially Pure Titanium Surface Hardness Improvement by Plasma Nitrocarburizing and Ion Implantation

2013 ◽  
Vol 789 ◽  
pp. 347-351 ◽  
Author(s):  
Agung Setyo Darmawan ◽  
Waluyo Adi Siswanto ◽  
Tjipto Sujitno
Keyword(s):  
Ion Implantation ◽  
Elevated Temperatures ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Commercially Pure Titanium ◽  
Hardness Tester ◽  
Hardness Number ◽  
Commercially Pure ◽  
Hardness Tests ◽  
Plasma Nitrocarburizing

Commercially pure (cp) titanium has a relative soft hardness property. In particular usage such as sliding, the improvement of the surface hardness will be required. In this study, surface hardness improvement of cp titanium by Plasma Nitrocarburizing and Ion Implantation are compared. Plasma Nitrocarburizing processes are conducted at different elevated temperatures with different duration processes, i.e. at 350 °C for 3, 4, and 5 hours, and at 450 °C for 2, 3, and 4 hours respectively, while Ion Implantation processes are conducted at room temperature and process durations are varied as 2.3 hours, 4.7 hours, and 9.3 hours. Nitrogen ions are used to implant the material. Hardness tests are then performed on each specimen by using Micro Vickers Hardness Tester. The surface hardness number (HV) for specimens of the Plasma Nitrocarburizing processes at temperature of 350 °C for process duration of 3 hours, 4 hours, and 5 hours are 74.16, 92.25 and 94.41, respectively while those at temperature of 450 °C for duration process of 2 hours, 3 hours, and 4 hours are 103.70, 121.31 and 126.17, respectively. The processes of Ion Implantation produce the surface hardness number (HV) of 88.97, 125.51, and 130.2, for duration processes of 2.3 hours, 4.7 hours, and 9.3 hours. The process of Ion Implantation produce higher surface hardness number than the Plasma Nitrocarburizing process at temperature 350 °C but the surface hardness number is lower when compared to the Plasma Nitrocarburizing at a temperature of 450 °C. For the duration processes 4 hours and more, the process of Ion Implantation produces the same surface hardness number with the Plasma Nitrocarburizing at temperature of 450 °C.

MST 3Al-2.5V

Alloy Digest ◽  
1959 ◽  
Vol 8 (4) ◽  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Elevated Temperature ◽  
Pure Titanium ◽  
Heat Treating ◽  
Commercially Pure Titanium ◽  
Bend Strength ◽  
Elevated Temperature Strength ◽  
Temperature Performance ◽  
Commercially Pure

Abstract MST 3A1-2.5V is a highly weldable titanium alloy having greater room and elevated temperature strength with greater flarability than commercially pure titanium. It is also age-hardenable. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength as well as creep and fatigue. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ti-18. Producer or source: Mallory-Sharon Metals Company.

scholarly journals Effect of Gasket Material on Crevice Corrosion of Commercially Pure Titanium

1983 ◽  
Vol 32 (2) ◽  
pp. 69-75
Author(s):  
Hiroshi Satoh ◽  
Fumio Kamikubo ◽  
Kazutoshi Shimogori ◽  
Toshio Fukuzuka
Keyword(s):  
Crevice Corrosion ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Gasket Material

scholarly journals Synchronized Full-Field Strain and Temperature Measurements of Commercially Pure Titanium under Tension at Elevated Temperatures and High Strain Rates

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 25
Author(s):  
Guilherme Corrêa Soares ◽  
Mikko Hokka
Keyword(s):  
Elevated Temperatures ◽  
High Strain ◽  
Pure Titanium ◽  
Heating System ◽  
Strain Rates ◽  
Commercially Pure Titanium ◽  
High Strain Rates ◽  
Noise Floor ◽  
Full Field ◽  
Commercially Pure

Understanding the mechanical behavior of materials at extreme conditions, such as high temperatures, high strain rates, and very large strains, is fundamental for applications where these conditions are possible. Although tensile testing has been used to investigate material behavior under high strain rates and elevated temperatures, it disregards the occurrence of localized strains and increasing temperatures during deformation. The objective of this work is to combine synchronized full-field techniques and an electrical resistive heating system to investigate the thermomechanical behavior of commercially pure titanium under tensile loading at high temperatures and high strain rates. An electrical resistive heating system was used to heat dog-bone samples up to 1120 °C, which were then tested with a tensile Split Hopkinson Pressure Bar at strain rates up to 1600 s−1. These tests were monitored by two high-speed optical cameras and an infrared camera to acquire synchronized full-field strain and temperature data. The displacement and strain noise floor, and the stereo reconstruction error increased with temperature, while the temperature noise floor decreased at elevated temperatures. A substantial decrease in mechanical strength and an increase in ductility were observed with an increase in testing temperature. The localized strains during necking were much higher at elevated temperatures, while adiabatic heating was much lower or non-existent at elevated temperatures.

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