Corrosion Effects on Fatigue Behavior of Zn-Cr+3 and Zn Flake Coated M8 DIN 933 Bolts

Abstract

In this study, fatigue behavior of Zn-Cr+3 and zinc flake coated bolts was investigated experimentally by considering corrosion effects. Fatigue tests were conducted on M8x50x1.25 8.8 DIN 933 bolts at normal and corroded conditions at force amplitudes between 2.35 and 5.36 kN at test frequency of 75 Hz. A part of bolts was subjected to salt atmosphere for corrosion. According to the Wöhler curves obtained from fatigue tests before corrosion, zinc flake coated bolts showed 1.55 times higher fatigue life compared to Zn-Cr+3. After corrosion, fatigue tests showed that the fatigue life difference increased to 2.10 times for the zinc flake coating. Moreover, corrosion was found to be ineffective on crack initiation region. For both coatings and corrosion conditions, fatigue cracks were seen to initiate from the thread roots.

Keywords

• Bolt
• fatigue life
• coating
• corrosion

References

1. [1] M. Metallurgy vd., “Elements of Metallurgy and Engineering Alloys”, Elem. Metall. Eng. Alloy., 2019, doi: 10.31399/asm.tb.emea.9781627082518.
2. [2] A. Hudgins ve B. James, “Fatigue of threaded fasteners”, Adv. Mater. Process., c. 172, sayı 8, ss. 18–22, 2014.
3. [3] P. Zampieri, A. Curtarello, C. Pellegrino, ve E. Maiorana, “Fatigue strength of corroded bolted connection”, Frat. ed Integrita Strutt., c. 12, sayı 43, ss. 90–96, 2018, doi: 10.3221/IGF-ESIS.43.06.
4. [4] L. Mordfin, “Some Problems of Fatigue of Bolts and Bolted Joints in Aircraft Applications”, U. S. Dep. Commer. Natl. Bur. Stand., 1962.
5. [5] S. Ifergane vd., “The effect of manufacturing processes on the fatique lifetime of aeronautical bolts”, Eng. Fail. Anal., c. 8, sayı 3, ss. 227–235, 2001, doi: 10.1016/S1350-6307(00)00013-3.
6. [6] A. L. Marcelo, A. Y. Uehara, R. M. Utiyama, ve I. Ferreira, “Fatigue properties of high strength bolts”, Procedia Eng., c. 10, ss. 1297–1302, 2011, doi: 10.1016/j.proeng.2011.04.216.
7. [7] M. N. A. S. Shuhaib, “Experimental Evaluation of the Effect of Thread Angle on the Fatigue Life of Bolts”, Int. J. Fatigue, c. 7, sayı 1, ss. 12–19, doi: 10.1016/j.ijfatigue.2004.06.011.
8. [8] G. H. Majzoobi, G. H. Farrahi, ve N. Habibi, “Experimental evaluation of the effect of thread pitch on fatigue life of bolts”, Int. J. Fatigue, c. 27, sayı 2, ss. 189–196, 2005, doi: 10.1016/j.ijfatigue.2004.06.011.

9. [9] S. Griza, M. E. G. da Silva, S. V. dos Santos, E. Pizzio, ve T. R. Strohaecker, “The effect of bolt length in the fatigue strength of M24×3 bolt studs”, Eng. Fail. Anal., c. 34, ss. 397–406, Ara. 2013, doi: 10.1016/j.engfailanal.2013.09.010.
10. [10] E. A. P. J.W. Hobbs, R.L. Burguete, P.F. Heyes, “The effect of eccentric loading on the fatigue performance of high-tensile bolts”, Int. J. Fatigue, c. 22, sayı 6, ss. 531–538, Tem. 2000, doi: 10.1016/S0142-1123(00)00004-9.
11. [11] L. Solazzi, R. Scalmana, M. Gelfi, ve G. M. L. Vecchia, “Effect of different corrosion levels on the mechanical behavior and failure of threaded elements”, J. Fail. Anal. Prev., c. 12, sayı 5, ss. 541–549, 2012, doi: 10.1007/s11668-012-9593-x.
12. [12] H. L. Wang, J. G. Xia, ve S. F. Qin, “High-strength bolt corrosion fatigue life estimate model and its application”, Dalian Haishi Daxue Xuebao/Journal Dalian Marit. Univ., c. 40, sayı 3, 2014.
13. [13] N. Sanaei ve A. Fatemi, “Analysis of the effect of surface roughness on fatigue performance of powder bed fusion additive manufactured metals”, Theor. Appl. Fract. Mech., c. 108, sayı March, s. 102638, 2020, doi: 10.1016/j.tafmec.2020.102638.
14. [14] B. Vayssette, N. Saintier, C. Brugger, ve M. El May, “Surface roughness effect of SLM and EBM Ti-6Al-4V on multiaxial high cycle fatigue”, Theor. Appl. Fract. Mech., c. 108, sayı March, s. 102581, 2020, doi: 10.1016/j.tafmec.2020.102581.
15. [15] V. Martín, J. Vázquez, C. Navarro, ve J. Domínguez, “Effect of shot peening residual stresses and surface roughness on fretting fatigue strength of Al 7075-T651”, Tribol. Int., c. 142, sayı October 2019, 2020, doi: 10.1016/j.triboint.2019.106004.
16. [16] A. du Plessis ve S. Beretta, “Killer notches: The effect of as-built surface roughness on fatigue failure in AlSi10Mg produced by laser powder bed fusion”, Addit. Manuf., c. 35, sayı March, s. 101424, 2020, doi: 10.1016/j.addma.2020.101424.