Is cobalt chromium corrosive?
In air and aqueous environments where oxygen is present, common biomedical alloys like titanium and cobalt chromium exhibit excellent corrosion resistance due to the spontaneous formation of titanium oxide [3] (TiO2) and chromium oxide [4] (Cr2O3) on their surfaces, respectively.
Is cobalt corrosion resistant?
Cobalt is useful in applications that utilize its magnetic properties, corrosion resistance, wear resistance, and/or its strength at elevated temperatures.
What is special about cobalt and chromium?
Cobalt-chromium (Co-Cr) alloys have high specific strength and are hard, tough, corrosion resistant, biocompatible metals. Besides titanium, cobalt chrome is one of the most widely used metals in knee implants.
Why is cobalt chromium used in implants?
Cobalt-chrome (Co-Cr) is a metal alloy of cobalt and chromium. Because of its high strength, temperature endurance and wear resistance, it is commonly used in dental and orthopedic implants. Co-Cr alloys are especially useful where high stiffness or a highly polished and extremely wear-resistant material is required.
What are cobalt alloys?
Cobalt-Based alloys are materials whose cobalt-basis is alloyed with elements such as chromium, tungsten, nickel and iron. Along with nickel-based alloys, they are used in challenging environments including high temperatures and acids.
Why is cobalt used in alloys?
Cobalt alloys have good magnetic properties, corrosion resistance, wear resistance, and high temperature strength. Relatively harder Co-alloys is used for resistance to wear. On the other hand the tougher Cobalt compositions are used for high-temperature applications such as gas-turbine vanes and buckets.
Why cobalt is used in alloys?
Generally, cobalt-based alloys display favourable mechanical properties. They are corrosion, wear and heat resistant and are therefore used for components in challenging areas applications, such as hot gas turbines. Cobalt also displays great resistance against sulfides, preventing any sulfidation of the material.
Where are cobalt alloys used?
Cobalt-chrome or cobalt-chromium (CoCr) is a metal alloy of cobalt and chromium. Cobalt-chrome has a very high specific strength and is commonly used in gas turbines, dental implants, and orthopedic implants.
What are the alloys of cobalt?
Cobalt based metals are alloyed with chrome, nickel, and tungsten. Due to the high cost of these alloys, they are used where severe conditions prevail and require high temperature strength and hardness, excellent wear, galling, corrosion, and/or erosion resistance.
What alloys use cobalt?
The color cobalt-blue is made of cobalt (II) oxides and aluminium oxides. The most common use of cobalt however is in metalworking as a strengthening alloy in steel and iron alloys.
What three metals are alloys?
Alloys by base metal
- Aluminium.
- Beryllium.
- Bismuth.
- Chromium.
- Cobalt.
- Copper.
- Gallium.
- Gold.
What are the properties of a cobalt alloy?
Cobalt alloys have good magnetic properties, corrosion resistance, wear resistance, and high temperature strength. These properties arise from the crystallographic nature of cobalt, the solid-solution-strengthening effects of Cr, W, and Mo, the formation of metal carbides, and the corrosion resistance imparted by Cr.
What are the different types of cobalt chromium?
Cobalt–chromium alloys can be mainly divided into two types: (i) Co–Cr–Mo alloy; and (ii) Co–Ni–Cr–Mo alloy. The cast Co–Cr–Mo alloy has been applied in dentistry for longevity of artificial joints.
Which is better cobalt chromium or stainless steel?
Cobalt-based alloys are better than stainless steel with regard to its corrosion stability. Cobalt–chromium alloys can be mainly divided into two types: (i) Co–Cr–Mo alloy; and (ii) Co–Ni–Cr–Mo alloy.
Which is the best alloy resistant to aqueous corrosion?
Nickel is an ideal base for alloys resistant to aqueous corrosion, for the following reasons: 1. There is a plentiful supply of nickel, at a reasonable price. 2. It is inherently more resistant to corrosion than iron. 3. It exhibits a ductile, face‐centered cubic structure (known as “gamma” phase, and which is similar to the favored