Analysis of the tribological performances of biodegradable hydraulic oils HEES and HEPR in the sliding of Cu–Zn/WC–CoCr alloys using the Stribeck curve

  • Richard de Medeiros CastroEmail author
  • Elvys Isaías Mercado Curi
  • Luiz Fernando Feltrin Inácio
  • Alexandre da Silva Rocha
Technical Paper


In surface engineering, new coatings and deposition techniques for decreasing wear have been proposed. However, the tribological behaviors of these coatings under lubricated sliding with biodegradable oils are unknown. The objective of this study was to evaluate the tribological behaviors of two hydraulic biodegradable oils, namely hydraulic environmental ester oil synthetic (HEES) and hydraulic oil environmental polyalphaolefin (HEPR), with hydraulic mineral oil (HLP), using a pin-on-disk tribometer. In the sliding tests, a Cu–35Zn sphere against a flat surface is coated with WC–10Co4Cr alloy using a HVOF thermal spray. The Stribeck curve was used to evaluate the performances of the lubricants. The coefficient of friction, the contact pressure, and the film thickness were determined. In addition, the coefficient of wear of the sphere was evaluated, and the oil with the lowest value was identified, which was HEPR in this case. In long-term tests, HEPR was affected by the stick–slip phenomenon, which increased the coefficients of friction and wear. Furthermore, the mechanism of adhesion of the sphere on the disk was more evident with the use of HEES compared to HLP. The highest concentrations of Zn and P and the pressure–viscosity coefficient value, which was detected in the mineral oil, caused friction reduction and lower damage to the surfaces. Therefore, it is important to evaluate the tribological conditions of synthetic bio-lubricants for applications in hydraulic systems.


Biodegradable oil Lubrication regimes Stribeck curve Coefficient of friction and wear Cu–35Zn WC–10Co4Cr 



  1. 1.
    Stachowiak GW (2017) How tribology has been helping us to advance and to survive. Friction 5(3):233–247. MathSciNetCrossRefGoogle Scholar
  2. 2.
    Zhang SW (2013) Green tribology: fundamentals and future development. Friction 1(2):186–194. CrossRefGoogle Scholar
  3. 3.
    Sasaki S (2010) Environmentally friendly tribology (eco-tribology). J Mech Sci Technol 24(1):67–71. CrossRefGoogle Scholar
  4. 4.
    Anand A, Haq MIU, Vohra K, Raina A, Wani MF (2017) Role of green tribology in sustainability of mechanical systems: a state of the art survey. Mater Today: Proc 4(2):3659–3665. CrossRefGoogle Scholar
  5. 5.
    Juraj T, Ľubomir H, Jan K, Juraj J, Michela J (2017) Evaluation of new biodegradable fluid on the basis of accelerated durability test, FTIR and ICP spectroscopy. Res Agric Eng 63(1):1–9. CrossRefGoogle Scholar
  6. 6.
    Mendonza YEA (2013) Sistematização do Projeto de Circuitos Hidráulicos para o Emprego de Fluidos Biodegradáveis. Ph.D. thesis, UFSC – Federal University of Santa Catarina, Mechanical Engineering, FlorianópolisGoogle Scholar
  7. 7.
    John Deere. Accessed 12 Oct 2018
  8. 8.
    Madanhire I, Mbohwa C (2016) Mitigating environmental impact of petroleum lubricants. Springer, New YorkCrossRefGoogle Scholar
  9. 9.
    Sapawe N, Syahrullail S, Izhan MI (2014) Evaluation on the tribological properties of palm olein in different loads applied using pin-on-disk tribotester. J Tribol 3:11–29Google Scholar
  10. 10.
    Regueira T, Lugo L, Fandino O, López ER, Fernández J (2011) Compressibilities and viscosities of reference and vegetable oils for their use as hydraulic fluids and lubricants. Green Chem 13:1293–1302. CrossRefGoogle Scholar
  11. 11.
    Mang T (2014) Encyclopedia of lubricants and lubrication. Springer, New YorkCrossRefGoogle Scholar
  12. 12.
    Majdan R, Tkáč Z, Kosiba J, Abrahám R, Jablonický J, Hujo L, Mojžiš M, Ševčík P, Rášo M (2013) Evaluation of tractor biodegradable hydraulic fluids on the basis of hydraulic pump wear. Res Agric Eng 59:75–82. CrossRefGoogle Scholar
  13. 13.
    Syahir AZ, Zulkifli NWM, Masjuki HH, Kalam MA, Alabdulkarem A, Gulzar M, Harith MH (2017) A review on bio-based lubricants and their applications. J Clean Prod 168:997–1016. CrossRefGoogle Scholar
  14. 14.
    Kučera M, Bujna M, Korenková M, Haas P (2014) Possibilities of using ecological fluid in agriculture. In: Advanced materials research 1059, 61–66. Trans Tech Publications. CrossRefGoogle Scholar
  15. 15.
    Tkáč Z, Čorňák S, Cviklovič V, Kosiba J, Glos J, Jablonický J, Bernát J (2017) Research of biodegradable fluid impacts on operation of tractor hydraulic system. Acta Technol Agric 20:42–45. CrossRefGoogle Scholar
  16. 16.
    Pirro DM, Webster M, Daschner E (2017) Lubrication fundamentals. CRC Press, FloridaGoogle Scholar
  17. 17.
    Diew M, Ernesto A, Cayer-Barrioz J, Mazuyer D (2015) Stribeck and traction curves under moderate contact pressure: from friction to interfacial rheology. Tribol Lett 57:1–10. CrossRefGoogle Scholar
  18. 18.
    Hu Y, Wang L, Politis DJ, Masen MA (2017) Development of an interactive friction model for the prediction of lubricant breakdown behaviour during sliding wear. Tribol Int 110:370–377. CrossRefGoogle Scholar
  19. 19.
    Blau PJ (2009) Friction science and technology: from concepts to applications. CRC Press, FloridaGoogle Scholar
  20. 20.
    Bayer RG (1994) Mechanical wear prediction and prevention. Marcel Dekker, Nova York. CrossRefGoogle Scholar
  21. 21.
    Bhushan B (2013) Principles and applications of tribology. Wiley, Hoboken. CrossRefGoogle Scholar
  22. 22.
    Holmberg K, Erdemir A (2017) Influence of tribology on global energy consumption, costs and emissions. Friction 5(3):263–284. CrossRefGoogle Scholar
  23. 23.
    Al-Sayed SRA, Hussein AHA, Nofal AAMS, Elnaby SEIH, Elgazzar HA, Sabour HA (2017) Laser powder cladding of Ti–6Al–4V α/β alloy. Materials 10(10):1–16. CrossRefGoogle Scholar
  24. 24.
    Yang Z (2011) Alternatives to hard chromium plating on piston rods. Ph.D. Thesis, Karlstads Universitet, Karlstad, SuéciaGoogle Scholar
  25. 25.
    Rachidi R, El Kihel B, Delaunois F, Vitry V, Deschuyteneer D (2017) Wear performance of thermally sprayed NiCrBSi and NiCrBSi-WC coatings under two different wear modes. J Mater Environ Sci 08(12):4550–4559. CrossRefGoogle Scholar
  26. 26.
    Silva Junior G, Voorwald HJC, Cioffi MOH (2017) Evaluation of Hvof sprayed WC–13Co–4Cr and hard chromium electroplated on stainless steel 15-5PH fatigue strength. In: Proceedings of the 7th international conference on mechanics and materials in design, vol 7, pp 405–416Google Scholar
  27. 27.
    Castro RM, Rocha AS, Curi EIM, Peruch F (2018) A comparison of microstructural, mechanical and tribological properties of WC–10Co4Cr-HVOF coating and hard chrome to use in hydraulic cylinders. Am J Mater Sci 8(1):15–26. CrossRefGoogle Scholar
  28. 28.
    Geng Z, Hou S, Shi GL, Duan DL, Li S (2016) Tribological behaviour at various temperatures of WC–Co coatings prepared using different thermal spraying techniques. Tribol Int 104:36–44. CrossRefGoogle Scholar
  29. 29.
    Liu YL, Cheng J, Yin B, Zhu SY, Qiao ZH, Yang J (2017) Study of the tribological behaviors and wear mechanisms of WC–Co and WC–Fe3Al hard materials under dry sliding condition. Tribol Int 109:19–25. CrossRefGoogle Scholar
  30. 30.
    Noorawzi N, Samion S (2015) Tribological effects of vegetable oil as alternative lubricant: a pin-on-disk tribometer and wear study. Tribol Trans 59(5):831–837. CrossRefGoogle Scholar
  31. 31.
    Savić V, Knežević D, Lovrec D, Jocanović M, Karanović V (2009) Determination of pressure losses in hydraulic pipeline systems by considering temperature and pressure. Stroj Vestn-J Mech Eng 55(4):37–43Google Scholar
  32. 32.
    Totten GE, De Negri VJ (2017) Handbook of hydraulic fluid technology. CRC Press, FloridaGoogle Scholar
  33. 33.
    Sharma BK, Biresaw G (2016) Environmentally friendly and biobased lubricants. CRC Press, FloridaCrossRefGoogle Scholar
  34. 34.
    Mang T, Dresel W (2017) Lubricants and lubrications. Wiley, Weinheim. CrossRefGoogle Scholar
  35. 35.
    Rexroth-Bosch Group (1993) Environmentally Acceptable hydraulic fluids HETG, HEPG, HEES for axial piston units. RE 90 221/01.02, ElchingenGoogle Scholar
  36. 36.
    Linsingen IV (2013) Fundamentos de Sistemas Hidráulicos. UFSC, FlorianópolisGoogle Scholar
  37. 37.
    Stachowiak GW, Batchelor AW (2013) Engineering tribology. Butterworth-Heinemann – BH, OxfordGoogle Scholar
  38. 38.
    Hamrock BJ, Dowson D (1981) Ball bearing lubrication, the elastohydrodynamics of elliptical contacts. Wiley, New York. CrossRefGoogle Scholar
  39. 39.
    Popova E, Popov VL (2015) The research works of Coulomb and Amontons and generalized laws of friction. Friction 3(2):183–190. CrossRefGoogle Scholar
  40. 40.
    Fildes JM, Meyers SJ, Mulligan CP, Kilaparti R (2013) Evaluation of the wear and abrasion resistance of hard coatings by ball-on-three-disk test methods: a case study. Wear 302:1040–1049. CrossRefGoogle Scholar
  41. 41.
    Li X, Sosa M, Olofsson U (2015) A pin-on-disk study of the tribology characteristics of sintered versus standard steel gear materials. Wear 340:31–40. CrossRefGoogle Scholar
  42. 42.
    Odabas D (2018) Effects of load and speed on wear rate of abrasive wear for 2014 Al alloy. In: IOP conference series: materials science and engineering 295, pp 1–13. CrossRefGoogle Scholar
  43. 43.
    Ernesto A, Mazuyer D, Cayer-Barrioz J (2015) From full-film lubrication to boundary regime in transient kinematics. Tribol Lett 59(23):1–10. CrossRefGoogle Scholar
  44. 44.
    Muller M, Stahl L, Ostermeyer GP (2018) Experimental studies of lubricant flow and friction in partially filled gaps. Lubricants 6(4):110. CrossRefGoogle Scholar
  45. 45.
    Wang Y, Wang QJ, Lin C, Shi F (2010) Development of a set of Stribeck curves for conformal contacts of rough surfaces. Tribol Trans 49(4):526–535. CrossRefGoogle Scholar
  46. 46.
    Dobrica MB, Fillon M, Maspeyrot P (2008) Influence of mixed-lubrication and rough elastic-plastic contact on the performance of small fluid film bearings. Tribol Trans 51(6):699–717. CrossRefGoogle Scholar
  47. 47.
    Lafountain AR, Johnston GJ, Spikes HA (2001) The elastohydrodynamic traction of synthetic base oil blends. Tribol Trans 44(4):648–656. CrossRefGoogle Scholar
  48. 48.
    Guegan J, Kadiric A, Gabelli A, Spikes H (2016) The relationship between friction and film thickness in EHD point contacts in the presence of longitudinal roughness. Tribol Lett 64(3):33. CrossRefGoogle Scholar
  49. 49.
    Thapliyal P, Thakre GD (2017) Correlation study of physicochemical, rheological, and tribological parameters of engine oils. Adv Tribol 2017:1–12. CrossRefGoogle Scholar
  50. 50.
    Komvopoulos V, Do E, Yamaguchi S, Ryason PR (2003) Effect of sulfur- and phosphorus-containing additives and metal deactivator on the tribological properties of boundary-lubricated steel surfaces. Tribol Trans 46(3):315–325. CrossRefGoogle Scholar
  51. 51.
    Moshkovich A, Perfilvev V, Lapsker I, Rapoport I (2010) Stribeck curve under friction of copper samples in the steady friction state. Tribol Lett 37(3):645–653. CrossRefGoogle Scholar
  52. 52.
    Ali, MKA, Ezzat FMH, El-Gawwad KAA, Salem MMM (2017) Effect of lubricant contaminants on tribological characteristics during boundary lubrication reciprocating sliding. Appl Phys 1: 1–16.
  53. 53.
    Asaff Y, De Negri VJ, Theissen H, Murrenhof H (2014) Analysis of the influence of contaminants on the biodegradability characteristics and ageing of biodegradable hydraulic fluids. Stroj Vestn J Mech Eng 60(6):417–424. CrossRefGoogle Scholar
  54. 54.
    Baets P, Degrieck J, De Velde FV, Van Peteghem AP (2000) Experimental verification of the mechanisms causing stick–slip motion originating from relative deceleration. Wear 243:48–59. CrossRefGoogle Scholar
  55. 55.
    Gao C (1995) Stick-slip motion in boundary lubrication. Tribol Trans 38(2):473–477. CrossRefGoogle Scholar
  56. 56.
    Bellemare SC, Dao M, Suresh S (2008) Effects of mechanical properties and surface friction on elasto-plastic sliding contact. Mech Mater 40:206–219. CrossRefGoogle Scholar
  57. 57.
    Rabinowicz E (1993) Wear of hard surfaces by soft abrasives. In: International conference on wear of materials, Reston, VAGoogle Scholar
  58. 58.
    Straffelini, G.: Friction and wear methodologies for design and control. Springer. Switzerland, Cham. Tracts in Mechanical Engineering, 85 (2015). Google Scholar
  59. 59.
    Shahabuddin M, Masjuki HH, Kalam MA, Bhuiya MMK, Mehat H (2013) Comparative tribological investigation of bio-lubricant formulated from a non-edible oil source (Jatropha oil). Ind Crops Prod 47(1):323–333. CrossRefGoogle Scholar

Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Richard de Medeiros Castro
    • 1
    Email author
  • Elvys Isaías Mercado Curi
    • 1
  • Luiz Fernando Feltrin Inácio
    • 1
  • Alexandre da Silva Rocha
    • 2
  1. 1.Department of Mechanical EngineeringSATC CollegeCriciúmaBrazil
  2. 2.Department of Metallurgical EngineeringFederal University of Rio Grande do Sul - UFRGSPorto AlegreBrazil

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