Environmental legislation and the electrification of vehicles place increased requirements on brake disks in terms of wear and corrosion resistance. Departing from a preliminary study, the present investigation examined the friction and wear behavior as well as the corrosion properties of Stellite™ 6 coatings on gray cast iron, which were deposited by laser cladding. The friction and wear experiments were conducted on a pin-on-disk tribometer at contact pressures of 1.0 and 2.0 MPa as well as rotation speeds of 0.2, 0.4, 0.6, 0.8, and 2.0 m/s. The pins are manufactured from an automotive semi-metallic brake pad. The friction behavior of gray cast iron and Stellite™ 6 coatings is similar under changing test conditions. The tribological behavior is strongly influenced by the microstructural and mechanical properties of the coatings and the brake pad material. A third body layer of contact patches is formed on Stellite™ 6, which mainly consists of brake pad components. The transformation of the Co-matrix (fcc → hcp), subsurface fatigue, and tribo-oxidation are the main wear mechanism for Stellite™ 6. The electrochemical characteristics were analyzed by potentiodynamic polarization, and the corrosion rate was determined with Tafel plots in 3.5% NaCl solution, respectively. Compared to gray cast iron, Stellite™ 6 coatings have a pronounced corrosion resistance due to the formation of a protective passive layer of Co and Cr oxides. This corrosion resistance is mainly influenced by the microstructure. The corrosion rate of the coatings increases in parallel with the Fe dilution.
MartiniGGrigoratosT.Non-exhaust traffic related emissions - Brake and tyre wear PM: Literature review, Vol. 26648 of EUR, Scientific and technical research series, Luxembourg: Publications Office, 2014.
2.
WahlströmJOlanderLOlofssonU.A pin-on-disc study focusing on how different load levels affect the concentration and size distribution of airborne wear particles from the disc brake materials. Tribol Lett2012; 46(2): 195–204.
3.
KukutschováJRoubíčekVMalachováK, et al. Wear mechanism in automotive brake materials, wear debris and its potential environmental impact. Wear2009; 267(5-8): 807–817.
4.
LangeJRuffSSteegeR, et al. Between high performance and zero emissions - Demands on friction materials of the future. In: XXIX. InternationalµSymposium, Brake Conference (ed BreuerB.), Bad Neuenahr/Germany, Fortschrittberichte VDI Reihe 12, Verkehrstechnik, Fahrzeugtechnik, VDI-Verlag, Düsseldorf, 29–30 October 2010, pp. 16–38.
5.
StanfordMKJainVK.Friction and wear characteristics of hard coatings. Wear2001; 251: 990–996.
CuevaGSinatoraAGuesserWL, et al. Wear resistance of cast irons used in brake disc rotors. Wear2003; 255(7-12): 1256–1260.
10.
WirthAEgglestonDWhitakerR.A fundamental tribochemical study of the third body layer formed during automotive friction braking. Wear1994; 179: 75–81.
11.
WilkeningLPaulH-GOstermeyerGP.Investigations on tribological memory effects in friction materials. SAE Int J Passenger Cars Mech Syst2014; 7(4): 1264–1273.
12.
JackoMGTsangPHRheeSK.Wear debris compaction and friction film formation of polymer composites. Wear1989; 133(1): 23–38.
13.
ErikssonM.Friction and contact phenomena of disc brakes related to squeal: Zugl.: Uppsala, Univ., Diss., 2000, Vol. 537 of Comprehensive summaries of Uppsala dissertations from the Faculty of Science and Technology, Acta Univ. Upsaliensis, Uppsala, 2000.
14.
JiangJStottFHStackMM.The role of triboparticulates in dry sliding wear. Tribol Int1998; 31(5): 245–256.
15.
ÖsterleWUrbanI.Friction layers and friction films on PMC brake pads. Wear2004; 257(1–2): 215–226.
16.
VasconcellosMAHinrichsRda CunhaJB, et al. Mössbauer spectroscopy characterization of automotive brake disc and polymer matrix composite (PMC) pad surfaces. Wear2010; 268(5–6): 715–720.
17.
ÖsterleWDörfelIPrietzelC, et al. A comprehensive microscopic study of third body formation at the interface between a brake pad and brake disc during the final stage of a pin-on-disc test. Wear2009; 267(5–8): 781–788.
18.
ÖsterleWUrbanI.Third body formation on brake pads and rotors. Tribol Int2006; 39(5): 401–408.
19.
ÖsterleWKloßHUrbanI, et al. Towards a better understanding of brake friction materials. Wear2007; 263(7-12): 1189–1201.
20.
SugishitaJFujiyoshiS.The effect of cast iron graphites on friction and wear performance I: graphite film formation on grey cast iron surfaces. Wear1981; 66: 209–221.
21.
FerozhkhanMMDuraiselvamMKumarKG, et al. Plasma transferred arc welding of Stellite 6 alloy on stainless steel for wear resistance. Procedia Technol2016; 25: 1305–1311.
22.
KusmokoADunneDLiH.Dilution and wear evaluation for Stellite 6 deposited on a martensitic stainless steel substrate by laser cladding. Int J Multidis Sci Eng2016; 7: 15–19.
23.
FrenkAKurzW.Microstructural effects on the sliding wear resistance of a cobalt-based alloy. Wear1994; 174: 81–91.
24.
Houdková PalaZSmazalováE, et al. Microstructure and sliding wear properties of HVOF sprayed, laser remelted and laser clad Stellite 6 coatings. Surf Coat Technol2017; 318: 129–141.
25.
GholipourAShamanianMAshrafizadehF.Microstructure and wear behavior of stellite 6 cladding on 17-4 PH stainless steel. J Alloys Comp2011; 509(14): 4905–4909.
26.
ZhuZOuyangCQiaoY, et al. Wear characteristic of Stellite 6 alloy hardfacing layer by plasma arc surfacing processes. Scanning2017; 2017: 1–7.
27.
FrenkAHenchozNKurzW.Laser cladding of a cobalt-based alloy: Processing parameters and microstructure. Zeitschrift für Metallkunde1993; 84: 886–892.
28.
ShinJ-CDohJ-MYoonJ-K, et al. Effect of molybdenum on the microstructure and wear resistance of cobalt-base Stellite hardfacing alloys. Surf Coat Technol2003; 166: 117–126.
29.
ChenHChenY.Wear behaviours of laser-clad Stellite alloy 6. Wear1996; 192: 78–84.
30.
LuoFCockburnALupoiR, et al. Performance comparison of Stellite 6® deposited on steel using supersonic laser deposition and laser cladding. Surf Coat Technol2012; 212: 119–127.
31.
BirolY.High temperature sliding wear behaviour of Inconel 617 and Stellite 6 alloys. Wear2010; 269(9–10): 664–671.
32.
JengM-CYanL-YDoongJ-L.Wear behaviour of cobalt-based alloys in laser surface cladding. Surf Coat Technol1991; 48: 225–231.
33.
KwokCTChengFTManHC.Synergistic effect of cavitation erosion and corrosion of various engineering alloys in 3.5% NaCl solution. Mater Sci Eng A2000; 290(1–2): 145–154.
34.
RosalbinoFScavinoG.Corrosion behaviour assessment of cast and HIPed Stellite 6 alloy in a chloride-containing environment. Electrochim Acta2013; 111: 656–662.
35.
MohamedKGadMNassefA, et al. Localized corrosion behaviour of powder metallurgy processed cobalt-base alloy Stellite 6 in chloride environments. Zeitschrift für Metallkunde1999; 90: 195–201.
36.
KimH-JKimY-J.Wear and corrosion resistance of PTA weld surfaced Ni and Co based alloy layers. Surf Eng1999; 15: 495–501.
37.
KarmakarDGopinathMHarmalkarS, et al. Investigation of wear and corrosion characteristics of Stellite-6 and Stellite-21 layers deposited by co-axial laser cladding. In: Proceedings of the ASME 2017 12th international manufacturing science and engineering conference, 2017, pp.1–6. New York: ASME.
38.
KiehlMScheidAGrafK, et al. Coaxial laser cladding of cobalt-base alloy Stellite™ 6 on grey cast iron analysis of the microstructural and mechanical properties depending on the laser power. J Mater Eng Perform2022. https://link.springer.com/article/10.1007/s11665-022-07358-3
39.
AndersonAE. Friction and wear of automotive brakes. In: TottenGE (ed.) ASM handbook: friction, lubrication, and wear technology. Materials Park, OH: ASM International, 1992, pp.569–577, Vol. 18.
40.
VermaPCCiudinRBonfantiA, et al. Role of the friction layer in the high-temperature pin-on-disc study of a brake material. Wear2016; 346-347: 56–65.
41.
DIN Deutsches Institut für Normung e. V. Corrosion of metals and alloys: Electrochemical test methods - Guidelines for conducting potentiostatic and potentiodynamic polarization measurements. 2008. DOI: 10.31030/1436020
42.
FontanaMG.Corrosion engineering. 3rd ed. McGraw Hill Series in Materials Science and Engineering. New York, NY: McGraw Hill, 1986.
43.
LinWCChenC.Characteristics of thin surface layers of cobalt-based alloys deposited by laser cladding. Surf Coat Technol2006; 200(14–15): 4557–4563.
44.
ASTM International. Standard practice for calculation of corrosion rates and related information from electrochemical measurements (2015). DOI: 10.1520/G0102-89R15E01
45.
EspositoAThrowerJR.Machine design. 2nd ed.New York, NY: Delmar Pub, 1991.
46.
BijweJ.Composites as friction materials: recent developments in non-asbestos fiber reinforced friction materials? A review. Polym Compos1997; 18(3): 378–396.
47.
ChoMHKimSJKimD, et al. Effects of ingredients on tribological characteristics of a brake lining: an experimental case study. Wear2005; 258(11-12): 1682–1687.
48.
HongUSJungSLChoKH, et al. Wear mechanism of multiphase friction materials with different phenolic resin matrices. Wear2009; 266(7-8): 739–744.
49.
OzekiS.Investigation for observing presence and distribution of phenolic resin in friction materials. SAE Technical Paper 2004-01-2781, 2004. https://doi.org/10.4271/2004-01-2781
50.
EddoumyFKasemHDhiebH, et al. Role of constituents of friction materials on their sliding behavior between room temperature and 400 °C. Mater Des2015; 65: 179–186.
51.
BodeKOstermeyerG-P.A comprehensive approach for the simulation of heat and heat-induced phenomena in friction materials. Wear2014; 311(1-2): 47–56.
52.
SellamiAKchaouMElleuchR, et al. Study of the interaction between microstructure, mechanical and tribo-performance of a commercial brake lining material. Mater Des2014; 59: 84–93.
53.
KimSSHwangHJShinMW, et al. Friction and vibration of automotive brake pads containing different abrasive particles. Wear2011; 271(7-8): 1194–1202.
54.
Hwan ParkJOh ChungJRae KimH. Friction characteristics of brake pads with aramid fiber and acrylic fiber. Ind Lubrication Tribol2010; 62(2): 91–98.
55.
JangHKimSJ.The effects of antimony trisulfide (Sb2S3) and zirconium silicate (ZrSiO4) in the automotive brake friction material on friction characteristics. Wear2000; 239(2): 229–236.
56.
VaishAK1MehrotraSP1GuptaRC. Thermodynamics and reduction kinetics of iron ore in direct reduction processes. J Metall Mater Sci2006; 48: 59–73.
57.
AboudaEDalMAubryP, et al. Effect of laser cladding parameters on the microstructure and properties of high chromium hardfacing alloys. Phys Procedia2016; 83: 684–696.
58.
JouvardJ-MGreveyDFLemoineF, et al. Continuous wave Nd:YAG laser cladding modeling: a physical study of track creation during low power processing. J Laser Appl1997; 9: 43–50.
59.
RatiaVLZhangDCarringtonMJ, et al. Comparison of the sliding wear behaviour of self-mated HIPed Stellite 3 and Stellite 6 in a simulated PWR water environment. Wear2019; 426–427: 1222–1232.
KumarMBijweJ.Studies on reduced scale tribometer to investigate the effects of metal additives on friction coefficient – temperature sensitivity in brake materials. Wear2010; 269(11–12): 838–846.
72.
KachhapRKSatapathyBK.Synergistic effect of tungsten disulfide and cenosphere combination on braking performance of composite friction materials. Mater Des2014; 56: 368–378.
73.
KchaouMSellamiAElleuchR, et al. Friction characteristics of a brake friction material under different braking conditions. Mater Des2013; 52: 533–540.
74.
BrechtJ. Properties of friction materials. In: XXIII Internationalµ-Symposium, Brake Conference (ed BreuerB), Bad Neuenahr/Germany, Vol. 556 of Fortschrittberichte VDI Reihe 12, Verkehrstechnik, Fahrzeugtechnik, VDI-Verlag, Düsseldorf, 24/25 October 2003, pp.1–23.
75.
PolakAGrzybekJ.The mechanism of changes in the surface layer of grey cast iron automotive brake disc. Mater Res2005; 8(4): 475–479.
76.
LathabaiS.An SEM study of mild-to-severe wear transition in grey cast iron during dry sliding. Scr Mater1998; 38(10): 1557–1562.
77.
TerheciMManoryRRHenslerJH.The friction and wear of automotive grey cast iron under dry sliding conditions part 2. Friction and wear—particle generation mechanisms and their progress with time. Wear1995; 185(1-2): 119–124.
78.
HinrichsRVasconcellosMAÖsterleW, et al. A TEM snapshot of magnetite formation in brakes: the role of the disc’s cast iron graphite lamellae in third body formation. Wear2011; 270(5–6): 365–370.
79.
BlauPJJollyBC.Wear of truck brake lining materials using three different test methods. Wear2005; 259(7–12): 1022–1030.
80.
ShorowordiKMHaseebASCelisJP.Chemical and structural nature of tribo-surface of aluminium–SiC composites at nanometre and micrometre length scales. Mater Sci Eng2006; 425(1–2): 213–218.
81.
GuldenFStichAGramstatS, et al. Investigations of the third body using pin-on-disk and brake dynamometer on Al-MMC brake rotors: EB2018-MDS-023. The Hague, Netherlands: EuroBrake, 2018.
82.
DaoudAAbou El-khairMT.Wear and friction behavior of sand cast brake rotor made of A359-20vol% SiC particle composites sliding against automobile friction material. Tribol Int2010; 43(3): 544–553.
LiuRYaoJHZhangQL, et al. Sliding wear and solid-particle erosion resistance of a novel high-tungsten Stellite alloy. Wear2015; 322-323: 41–50.
85.
RémyL.The interaction between slip and twinning systems and the influence of twinning on the mechanical behavior of fcc metals and alloys. Metallurgical Trans A1981; 12(3): 387–408.
86.
AtamertSBhadeshiaHKDH. Comparison of the microstructures and abrasive wear properties of Stellite hardfacing alloys deposited by arc welding and laser cladding. Metall Trans1989; 20: 1037–1054.
87.
BetteridgeW.Cobalt and its alloys. Chichester, West Sussex, New York: E. Horwood; Halsted Press, 1982.
88.
BhansaliKJMillerAE.The role of stacking fault energy on galling and wear behavior. Wear1982; 75(2): 241–252.
89.
ZhangSWangF.Comparison of friction and wear performances of brake material dry sliding against two aluminum matrix composites reinforced with different SiC particles. J Mater Process Technol2007; 182(1-3): 122–127.
LemaireELe CalvarM.Evidence of tribocorrosion wear in pressurized water reactors. Wear2001; 249(5-6): 338–344.
92.
RaduILiDY.Investigation of the role of oxide scale on Stellite 21 modified with yttrium in resisting wear at elevated temperatures. Wear2005; 259(1-6): 453–458.
93.
InmanIADattaPS.Studies of high temperature sliding wear of metallic dissimilar interfaces IV: Nimonic 80A versus Incoloy 800HT. Tribol Int2011; 44(12): 1902–1919.
94.
RoyMPauschitzAWernischJ, et al. The influence of temperature on the wear of Cr3C2–25(Ni20Cr) coating—comparison between nanocrystalline grains and conventional grains. Wear2004; 257(7-8): 799–811.
95.
YuHAhmedRLovelockHDV, et al. Influence of manufacturing process and alloying element content on the tribomechanical properties of cobalt-based alloys. J Tribol2009; 131(1): 12. DOI: 10.1115/1.2991122
96.
CrookPLiCC.The elevated temperature metal-to-metal wear behavior of selected hardfacing alloys. Wear Mater1983; 272–279.
97.
StottFHStevensonCWWoodGC.Friction and wear properties of Stellite 31 at temperatures from 293 to 1073K. Metals Technology1977; 4(1): 66–74.
98.
KaescheH.Die Korrosion der Metalle: Physikalisch-chemische Prinzipien und aktuelle probleme. 3rd ed.Berlin, Heidelberg: Klassiker der Technik, Springer, 2011.
99.
TostmannK-H. Korrosion: Ursachen und Vermeidung, Wiley-VCH, Weinheim, 2005.
100.
GaidaB.Einführung in die Galvanotechnik: Grundlagen der chemischen, elektrochemischen, physikalischen und elektrotechnischen Begriffe. 8th ed.Bad Saulgau: Lehrbuchreihe Galvanotechnik, Leuze, 2004.
101.
WhittenbergerJD.A review of: “Superalloys II”. Mater Manuf Process1992; 7(3): 463–468.
102.
ScullyJC. The fundamentals of corrosion. 2nd ed. Vol. 17 of Pergamon International Series on Materials Science and Technology. Oxford: Pergamon, 1975.
103.
FontanaMG.Corrosion engineering. 3rd ed. McGraw-Hill Series in Materials Science and Engineering. New Delhi: Tata McGraw-Hill, 2005.
104.
SinghRKumarDMishraSK, et al. Laser cladding of Stellite 6 on stainless steel to enhance solid particle erosion and cavitation resistance. Surf Coat Technol2014; 251: 87–97.
105.
AbioyeTEMcCartneyDGClareAT.Laser cladding of Inconel 625 wire for corrosion protection. J Mater Process Technol2015; 217: 232–240.
