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Sunday, 04 June 2023 16:45

Corrosion Resistance of Different Types of Cobalt Chromium Alloy after Heat Treatment

1Evan Hussain Alwan, BSc. and 2Sabiha Mahdi Kanaan, MSc
1, 2 Department of Prosthetic Dental Technology, College of Health and Medical
Techniques, Middle Technical University, Baghdad, Iraq.
Corresponding Author: Evan Hussain Alwan
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received 21 December 2022.
Accepted for publication on March 21, 2023.
Published May 29, 2023.

Background Corrosion is a process whereby the deterioration of a metal is caused by a reaction with its environment. Objectives The purpose of the present study is to evaluate and compare the effect of the milling technique surface for, CAD/CAM soft metal Co-Cr alloy specimens and selective laser melting on corrosion resistance. Materials and Methods Twenty discs CAD/ CAM technology subtractive and sub-additive devices were used to create Co-Cr alloy specimens, designing the discs using soft milling (kera® soft –Disc) and selective laser melting (Starbond CoS Powder). Each group was divided according to the material used in its construction. All samples for further investigation were prepared as drilled discs with a diameter of 15 mm as well as a height of 3mm. Scanning electron microscope (SEM) to examine the topography or the surface morphology changed after the effect of corrosion, images at a magnification of 400x were taken for one specimen of each group to evaluate surface topography and to investigate the porosity of the metal framework and the elemental composition was determined using energy dispersive X-ray spectroscopy (EDS). Degreased and water-vapor-steam-cleaned specimens and heat treatment equal to a full firing schedule were applied to all specimens in the (Vita, VACUMAT 6000M)furnace device. And then Scanning electron microscope (SEM) with (EDS) after heating (10 discs) select one sample for each group. The sample exposed to artificial saliva solution prepared in the laboratory electrochemical corrosion test was done when polarization potential, the open circuit potential and the corrosion rate of the samples were measured in the CHI 604e potentiostat type Corrosion device. Data were analyzed via Games-Howell and Levenes test. Results The mean corrosion value of the CAD/ CAM group was 0.0071(±.0016) and the laser group is.0036 (±.0023); the statistical analysis pointed out significant differences between the two groups (P<0.05). A significant decrease was found in the laser groups. Conclusion It can be concluded from this research that the metal-ceramic corrosion test varies depending on the production method, and the preferable method is sub-additive (selective laser melting) over subtractive milling.


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