Dissertation > Excellent graduate degree dissertation topics show

Surface Abrasion Resistance and Anticorrosion Performance of Laser Cladding Coating on Oil Pumping Polished Rod

Author: ZhangChunCheng
Tutor: BiFengQin
School: Daqing Petroleum Institute
Course: Materials Science
Keywords: Laser cladding Organizational structure Microhardness Friction and wear Polarization curves
CLC: TG174.44
Type: Master's thesis
Year: 2010
Downloads: 95
Quote: 2
Read: Download Dissertation

Abstract


Pumping shiny rod is widely used in the oil production in the way of the rod equipment, but due to reasons such as mechanical and corrosive wear occurs frequently wear and corrosion failure in use, restricting the development of sucker rod pumping technology, laser cladding technology on pumping the shine lever surface modified to improve its anti-wear corrosion engineering has a very important significance. In this paper, pumping the shiny rod used 20CrMo steel as the base material, select the cobalt-based, nickel-and iron-based alloy powder cladding material, 5KW HGL9450-000 cross-flow CO2 laser, feeding powder cladding processing, access to the compact macro-defect laser cladding layer, in order to improve the pumping shiny rod wear resistance and corrosion resistance. Using an optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis of test equipment cladding layer phase composition and microstructure analysis; using the MPX-2000 the disk pin friction and wear test machine 20CrMo steel and three self-fluxing alloy coating sample friction and wear testing; determination of the corrosion electrochemical properties of laser cladding layer use the Gamry PCI4/750 electrochemical test system. The results show that laser cladding process parameters have a great impact on the cladding layer macro-morphology, microstructure and coating performance in laser cladding process parameters P = 3.2KW, Vs = 9mm / s, D = 5mm conditions, to obtain a smooth and dense surface of the cladding layer, the organization is small and uniform, the dilution ratio is small, high hardness, and to achieve a good metallurgical bond with the substrate. Cladding type having the characteristic of rapid solidification, the microstructure of the different parts of the G / R with the solidification process of the type cladding layer; convective motion in the molten bath to promote the diffusion of the alloying elements in the molten bath added , prompting the alloying elements and the molten pool of liquid mixed thoroughly, have an important impact on the quality of laser cladding coating. Phase analysis of the results showed that the Co alloy coating is mainly composed by a gamma-Co phase and (Cr, W) 7C3 two-phase composition; Ni-based alloy coating phase mainly by gamma-(Ni, Cr, Fe), Cr23C6 FeNi3 and Ni2.9Cr0.7Fe0.36; Fe-based alloy phase by gamma-Fe FeNi3 Cr2Fe6.37Mo0.1Ni1.3Si0.3 C0.09Fe1.91 phase composition. The alloy coating hardness test results: Co-based alloy coating 520HV0.2 Ni-based alloy coating 408HV0.2, Fe-based alloy coating 370HV0.2 20CrMo alloy hardness of the matrix 265HV0.2; After laser cladding specimen hardness than the matrix improved significantly. To increase the degree of the wear amount of the matrix along with the increase of the load in the abrasion test, as the load increases the coefficient of friction has a decreasing tendency, faster than the increased wear of the coating amount after laser cladding; Laser Cladding abrasion and wear properties than the matrix greatly improved. Corrosion tests showed that, compared with the substrate 20CrMo alloy steel, laser cladding layer has a stronger pitting corrosion resistance and alkali corrosion capacity, the cladding layer of the corrosion current than 20CrMo alloy up to three orders of magnitude, laser cladding layer the corrosion resistance can be greatly improved compared to the substrate.

Related Dissertations

  1. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  2. Organizational Operation Research of Primary and Secondary School Co-operation Committee,G636
  3. Study on Technics & Performance of Nano Electroless Composite Plating on 20~# Steel,TQ153
  4. Study on Histology and Cytology Characteristics in Flue-cured Tobacco Upper Leaves in Southeast Sichuan during Growth and Development,S572
  5. JD cement centralized procurement and supply systems optimization,F426.71
  6. EMU maintenance base in Guangzhou Project Management Research,F532
  7. Chemical Construction Company Human Resource Management,F426.7
  8. Study for the Organizational Structure Based on the Development Mode Transformation and the Grid Update of Gansu Electric Power Corporation,F426.61
  9. Research on Project Organizational in a Small Private High-tech Company,F276.44
  10. Research on the Organization of Large-scale Integrated Project Management,F284
  11. Study on Laser Surface Modification of Two Kinds of Super-alloys,TG174.4
  12. Preperation of Low Friction and Wear Resistant High-Purity Alumina Ceramic,TQ174.1
  13. Internal control based on the organizational structure of the risks and precautions,F275
  14. 2205 Corrosion Research,TG142.71
  15. Magnesium alloy surface MoS2 / resin hybrid layer Preparation and Properties,TG174.4
  16. Multicomponent gradient composition of rigid composite film cutter,TG71
  17. School history textbooks Preliminary design concepts and organizational structure,G633.51
  18. Project management concept in the field of continuing education in the practical application,G720
  19. Full-service era Telecom R \u0026 D Project Management Applied Research,F626
  20. Repeated upsetting suppress Mg-Si alloys prepared microstructure and properties,TG146.22
  21. Research on Laser Cladding 4169 Superalloy Coating,TG174.44

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection
© 2012 www.DissertationTopic.Net  Mobile