Improvement of accelerated corrosion test methods

Introduction (problem statement and relevance). Intensive development and improvement of automobile design dictated by the increasing level of requirements and expectations on the part of the consumer is followed by development and introduction into production of new structural materials having higher corrosion resistance and anti-corrosion protection, as well as extension of the declared durability (service life) of standard products up to 8–12 years. This causes emergence of tasks of ensuring of accelerated assessment of efficiency of protective properties of the body as a whole and of its individual panels considering their location on the object, availability of interface (contact) with other elements, nature and intensity of external influence.

 The purpose of the study is to develop and improve methods of accelerated corrosion tests allowing, already at the initial stage of testing, prediction of further corrosion behavior and expected parameters of corrosion damage with the given operating time of the product.

Methodology and research methods. Experimental and instrumental methods of study of corrosion behavior, as well as mathematical modeling methods were applied. Scientific novelty and results. The scientific novelty of the study consists in the following: peculiarities of corrosion behavior on outer panels of a complete vehicle body were identified; a procedure was developed to determine expected parameters of corrosion damage of body panels within a complete vehicle with the given operating time; calculated dependencies to determine numerical values of parameters used in the developed procedure were experimentally proved.

The result of the study is providing the possibility of predicting parameters of corrosion damage of metal elements of a vehicle body with the given operating time under various conditions of external influence.

 Practical significance. The results of the study can be applied for planning corrosion tests; prompt introduction of necessary corrections in test programs; assessment of compliance of anti-corrosion protection of a particular component on a complete object; comparative assessment of efficiency of different types of anti-corrosion protection of body elements; prompt introduction of design and technological changes in terms of corrosion protection during testing following intermediate results without waiting for the tests to end.

1. Mishchenkov N.A. [Development of methods for accelerated testing of corrosion resistance of automotive equipment. Cand. eng. sci. diss.]. Moscow, 1999. 197 p. (In Russian)

2. [Development of methods for accelerated testing of corrosion resistance of automotive equipment. Scientific and technical report. NAMI Testing Center]. Dmitrov, 1999. (In Russian)

3. [RD 37.052.321-98. Bodies (cabins) of motor vehicles. Fragments, parts and units of bodies and cabins. Building structures and products. Methods of accelerated tests for corrosion resistance, NAMI Testing Center]. (In Russian)

4. [Directory, glossary. Avtostal]. Available at: http://trestprom.ru/tehnicheskaya_informaciya/spravochnik_glossarij/avtostal/ (accessed 31 January 2025). (In Russian)

5. Pei J., Jin Zh. [Discussion of the development trends of automotive metal materials]. International Journal of Humanities and Natural Sciences, 2024, vol. 9-5 (96), pp. 28-31. DOI: 10.24412/2500-1000-2024-9-5-28-31. (In Russian)

6. [Hot-dip galvanizing. Recommendations for users of hot-dip galvanizing]. Available at: www.agrisovgas.ru (accessed 31 January 2025). (In Russian)

7. Pakhomov V.S. [Corrosion of metals and alloys. Handbook. In 2 books. Book 1]. Moscow, Nauka i tekhnologiya Publ., 2013. 448 p. (In Russian)

8. Fromm H.J. Corrosion of auto-body steel and the effects of inhibited deicing salts. Department of Highways. Ontario, 1967. 67 p.

9. [Nonlinear incremental structural mechanics. Interaction of structures with aggressive environments, GSSSD 152]. Available at: https://studref.com/542821/stroitelstvo/modeli_poverhnostnogo_korrozionnogo_razrusheniya (accessed 31 January 2025). (In Russian)

10. [Verhulst model. Online calculator]. Available at: https://planetcalc.ru/9865/ (accessed 31 January 2025). (In Russian)

11. Mikhaylovskiy Yu.N., Panchenko Yu.M., So kolov N.A. [State standard reference data service. Tables of standard reference data. Low carbon steels, Zn, Cu, Al, Mg-alloy. Corrosion speed in the atmosphere. Approved by the USSR State Committee for Product Quality Management and Standards on December 4, 1990 (Protocol No. 9)]. (In Russian).

12. [Online calculator. Approximation of a function of one variable]. Available at: https://planetcalc.ru/5992/ (accessed 31 January 2025). (In Russian)