Experimental study of the film forming anticorrosion compounds on the fatigue of riveted joints

Eugene Gavrylov

Abstract


The subject matter of this article is the influence of film-forming corrosion preventive compounds on aviation riveted joints fatigue life. The goal of this work is to develop a method for the assessment of negative side effects caused by the application of corrosion preventive compounds. Tasks of the work are as follows: analysis of the aircraft corrosion problem; critical review of existing publications concerning possible negative side effects caused by the application of corrosion preventive compounds  for protection of aviation riveted joints against corrosion, where reduction of the fatigue life is considered as a result of the preventive compounds penetration into the gaps of riveted joints; development of the specimen for fatigue tests, with features of contemporary transport aircraft typical design; fatigue tests of the riveted specimens treated with preventive compounds and without treatment; investigation of the preventive compounds penetration into the gap of riveted joint. The main method of this research is fatigue loading of the riveted specimens at loads close to those the aircraft encounters in service. The main result is the experimentally proven possibility of negative side effects of corrosion preventive compound application. The observed effect is explained by the change in friction in joints and the corresponding redistributions of the forces between the joint elements. It was found that a factor influencing friction force is the viscosity of the preventive compounds. The possibility of preventing negative side effects by optimizing the protective procedure has been experimentally proven. Conclusions. The results presented in the paper show the probability of the negative side effects of corrosion preventive compound application. Considering the variety of these materials and their physical and chemical characteristics, the necessity   of the grounded selection of the protective compounds is evident as well as the optimization of the treatment technology. Conducted research has revealed an example of the negative influence of preventive compounds on riveted joints fatigue life and has opened the way for this effect prevention. The described research procedure is a component of the complex method for exploring corrosion preventive compounds’ negative side effects.

Keywords


planes of transport category; riveted joints; corrosion; corrosion preventive compounds; fatigue life; negative effects; friction in joints

References


Dey, M. K., Kim, D., & Tan, H. Finite element parametric study of the split sleeve cold expansion on residual stresses and pulling force. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2022, vol. 236, iss. 5, pp. 2447-2461. DOI: 10.1177/09544062211025563.

Jaya, A., Tiong, U. H., Mohammed, R., Bil, C., & Clark, G. Corrosion treatments and the fatigue of aerospace structural joints. Procedia Engineering, 2010, vol. 2, iss. 1, pp. 1523-1529. DOI: 10.1016/j.proeng.2010.03.164.

Purry, C., Fien, A., & Shankar, K. The effect of corrosion preventative compound on fatigue crack growth properties of 2024-T351 aluminium alloys. International Journal of Fatigue, 2003, vol. 25, iss. 9-11, pp. 1175-1180. DOI: 10.1016/j.ijfatigue.2003.08.016.

Kishkina, S. I., & Fridlyander, I. N. Aviatsionnyye materialy. Tom 4. Alyuminiyevyye i berilliyevyye splavy. Chast' I. Deformiruyemyye alyuminiyevyye splavy i splavy na osnove berilliya. Kniga 1 [Aviation materials. Volume 4. Aluminum and beryllium alloys. Part I. Wrought aluminum alloys and beryllium-based alloys. Book 1]. Moscow, ONTI Publ., 1982. 625 p. Available at: https://www.twirpx.com/file/2090825/ (accessed 12/12/2023) (In Russian).

Marochnik stali i splavov [Brand of steel and alloys]. Available at: http://www.splav-kharkov.com/simil2_mat.php?type_id=11&name_id_113=2542&name_id_165=1452&count_mat=286. (accessed 12/12/2023) (In Russian).

Safety Data Sheet Ardrox AV 8 Aerosol DME. Available at: https://bac-online.com/content/PDF/AV8DME13-50Z_SDS.pdf (accessed 12/12/2023).

Zakalov, O. V., & Zakalov, I. O. Osnovy tertya i znoshuvannya v mashynakh [Basics of friction and wear in machines]. Ternopil, Vydavnytstvo TNTU im. I.Pulyuya, 2011. 234 p. Available at: http://elartu.tntu.edu.ua/handle/123456789/1076 (accessed 12/12/2023) (In Ukrainian).

Raja, P. M. V., & Barron, A. R. 2.6: V'yazkistʹ [2.6: Viscosity]. Available at: https://ukrayinska.libretexts.org/Хімія/Аналітична_хімія/Фізичні_методи_в_хімії_та_нанонауці_(Barron)/02%3A_Фізичний_і_термічний_аналіз/2.06%3A_В%27язкість (accessed 12/12/2023) (In Ukrainian).

Safety Data Sheet Ardrox AV 8. Available at: https://cdn11.bigcommerce.com/s-jifykode7m/product_images/uploaded_images/msds/SGP98072.pdf (accessed 12/12/2023).

Safety Data Sheet according to Regulation (EC) No. 1907/2006. Ardrox AV 25. Available at: https://p11.secure.hostingprod.com/@site.skygeek.com/ssl/MSDS/chemetall-ardrox-av-25-corrosion-inhibiting-compound-5-gallon%20(1).pdf (accessed 12/12/2023).

Safety data sheet Ardrox AV 30. Available at: https://www.fds.supavia.eu/ARDROX%20AV%2030%20FDS%20ENG.PDF (accessed 12/12/2023).




DOI: https://doi.org/10.32620/aktt.2024.1.05