Composite coatings on stainless steel

Arnold, Callum (2012). Composite coatings on stainless steel B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Arnold, Callum
Thesis Title Composite coatings on stainless steel
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2012
Thesis type B.Sc Thesis
Supervisor Mingzing Zhang
Total pages 34
Language eng
Subjects 0912 Materials Engineering
Formatted abstract
Stainless steel is an important engineering material which is often used in low cost and corrosive environments. Stainless steel display excellent corrosion resistant due to the chromium additives in the alloy creating a self repairing surface layer. While stainless steel has good corrosion properties it has poor wear resistance and its uses in certain industries (i.e. food production and pharmaceuticals) will not allow for lubrication. In industrial applications abrasive wear and galling will damage stainless steel parts limiting the life time of the parts. This project will look into the use of cold spray coatings to increase the wear resistance of stainless steel while keeping comparable corrosion properties to the bulk material.

This experimental study will involve the testing of cold sprayed 316L stainless steel and the cold spray coatings used in the study was stainless steel. The sample coupons are 13x13x10mm in size and the coating thickness will vary between the different powders compositions. The stainless steel coating powder, 316L at 70wt% d90 ≤10μm + 30wt% d90 ≤16μm, was made with varied amounts of ceramic/metal powders (alumina and tungsten carbide); the mix of the powders at at 20%, 40% by weight. The powder was applied to the samples using the Inovatic KM-CDS 2.2-R. The powder was applied to the coupon samples using helium gas as the medium with the stagnation conditions of 120psi (830kPa). Tests was conducted to determine the difference in corrosion and wear performance as well as coating properties between the samples.

The results show that for the current composite coating that there is little change in wear properties after coating and the coating have minimal effects on the corrosion properties of the substrate. It is my recommendation that a larger sample size needs to be tested, as well as an increase in the scope of test to determine a more accurate wear loss between the substrates and the coatings.
Keyword Stainless steel 316L
Corrosion
Coating

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Wed, 24 Sep 2014, 15:57:13 EST by Jessica Minshull on behalf of Scholarly Communication and Digitisation Service