The Effect of Surface Conditions on Corrosion Resistance of a Cobalt-Chromium Alloy

2021 ◽  
Vol 887 ◽  
pp. 358-363
Author(s):  
V.S. Spektor ◽  
S.M. Sarychev ◽  
A.A. Orlov
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Medical Devices ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Implantable Medical Devices ◽  
Surface Conditions ◽  
Cobalt Chromium Alloy ◽  
Effect Of Surface

The article discusses the effect of the surface conditions on the corrosion resistance of alloys based on cobalt, titanium and stainless steel, which are currently used for the manufacture of components for implantable medical devices. It is shown that an increase in surface roughness has practically no effect on the corrosion resistance of alloys based on cobalt and titanium.

EDM performance characteristics and electrochemical corrosion analysis of Co-Cr alloy and duplex stainless steel: A comparative study

2020 ◽  
pp. 095440892097673
Author(s):  
Amit Mahajan ◽  
Gurpreet Singh ◽  
Sandeep Devgan ◽  
Sarabjeet Singh Sidhu
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Duplex Stainless Steel ◽  
Electrode Materials ◽  
Removal Rate ◽  
Electrochemical Corrosion ◽  
Machining Parameters ◽  
Chromium Alloy

Cobalt-chromium alloy (F-90) and duplex stainless steel (DSS-2205) belong to the family of metallic biomaterials, which are frequently used for the manufacture of dental prosthetics, artificial implants including knee and hip joints. This article addresses the investigation highlights of electrical discharge machining (EDM) of Co-Cr alloy and duplex stainless steel using different electrode materials for the evaluation of optimum machining parameters. The samples with superior machining performance and surface integrity were analyzed by electrochemical corrosion testing and found that the EDM treated samples portrayed a notable improvement in the corrosion resistance compared to bare metal. Our results demonstrated that both the substrates i.e. Co-Cr alloy and DSS-2205 were dominantly affected by the intensity of the applied current, and participated in the material removal rate with a contribution of 93.81% (23.37 mm3/min., Co-Cr alloy) and 87.32% (39.76 mm3/min., DSS-2205) respectively. However, the surface roughness of the machined Co-Cr alloy (1.080 µm) was majorly influenced by the current (contribution: 67.24%) and electrode (contribution: 28.27%). Whereas, pulse-on (contribution: 58.37%) and electrode (contribution: 30.52%) were significant for the surface roughness (1.150 µm) of the machined DSS-2205. Moreover, the machined surface also demonstrates the porosity (∼3 to ∼5 µm) and formation of intermetallic oxides, carbon phases on the samples machined at a higher value of current i.e. 16 Ampere. Field emission scanning electron microscopy and X-ray diffractometer were used to scrutinize the surface topography and compositional analysis of the machined substrates. The alternation of the substrate surface observed helpful in enhancing the corrosion resistance of Co-Cr alloy and duplex stainless steel by 80.88% (corrosion rate: 0.00029 mm/year) and 96% (corrosion rate: 0.00763 mm/year), comparative to their respective untreated samples.

DELORO STELLITE 25

Alloy Digest ◽  
2021 ◽  
Vol 70 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
Chromium Alloy ◽  
Cobalt Chromium ◽  
Alloy Matrix ◽  
Cobalt Base Alloy ◽  
Cocr Alloy ◽  
Cobalt Base ◽  
Cobalt Chromium Alloy

Abstract Deloro Stellite 25 is a cobalt-chromium-tungsten-nickel alloy. This tungsten strengthened cobalt-chromium alloy is the cast version of the wrought cobalt-base alloy L605. Deloro Stellite 25 is resistant to wear, galling, and corrosion and retains this resistance at high temperatures. Its exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as machining. Filing Code: Co-142. Producer or source: Deloro Wear Solutions GmbH.

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