Improvement of mechanical properties and corrosion behavior of drilling equipments columns by cermic coatings
Dissertant
Thesis advisor
University
University of Technology
Faculty
-
Department
Department of Materials Engineering
University Country
Iraq
Degree
Master
Degree Date
2013
English Abstract
The derrick frames of oil wells which are composed of low alloy steel are affected by different environmental conditions such as weather, H2S gas, CO2 gas, mud etc.
So to protect these frames, a thermal spraying technique was used.
Three types of ceramic materials have been used for the coatings which are zirconia, alumina and a composite of them (Al2O3 + 15% wt ZrO2 (powders.
Composite powder (93% Ni + 7%Al) used as a bond coating on the surface of the substrate for all types of coating.
Average coating thickness measurements was performed by optical microscope which shows zirconia coating has the smallest a thickness of 20.26 μm while the highest thickness is for composite coating of 216μm and 108μm for alumina coating.
Hardness measurements for coated and uncoated samples which shows increasing of hardness values for coated samples and the maximum hardness for the composite coating having a number of 250 HB while 198 HB for zirconia coating and 180 HB for alumina.
Adhesion strength measurements for ceramic coatings was performed by tension load which shows higher values of adhesion strength for ceramic coatings.
Impact strength and fracture toughness measurements for coated and uncoated samples were performed by izod which shows increasing of impact strength and fracture toughness for composite coating, alumina coating, zirconia coating respectively.
Fatigue life measurements for coated and uncoated samples was performed by rotating-bending which shows increasing of fatigue life for ceramic coatings and the higher value of fatigue limit for composite coating.
Wear rate measurements for coated and uncoated samples was performed by pin on disc which shows decreasing of wear rate for ceramic coating and the lowest values for zirconia coating.
Corrosion rate measurements for coated and uncoated samples was performed by potentiostat at pH 3 and pH 5 which shows decreasing of corrosion rate for ceramic coatings at two pH (pH 3, pH 5) especially for pH 5 and the lowest values of corrosion rate for composite coating.
All the enhancement of these properties supports the good microstructure of the specimens through the micrographs of SEM and optical microscopy.
Main Subjects
Engineering & Technology Sciences (Multidisciplinary)
American Psychological Association (APA)
Faiq, Lamees Salam. (2013). Improvement of mechanical properties and corrosion behavior of drilling equipments columns by cermic coatings. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-418090
Modern Language Association (MLA)
Faiq, Lamees Salam. Improvement of mechanical properties and corrosion behavior of drilling equipments columns by cermic coatings. (Master's theses Theses and Dissertations Master). University of Technology. (2013).
https://search.emarefa.net/detail/BIM-418090
American Medical Association (AMA)
Faiq, Lamees Salam. (2013). Improvement of mechanical properties and corrosion behavior of drilling equipments columns by cermic coatings. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-418090
Language
English
Data Type
Arab Theses
Record ID
BIM-418090
