Corrosion of aluminum alloy grade 1575-1 and formation of surface organosilicon layers to inhibit corrosion

• M.A. Petrunin, L.B. Maksaeva, M.A. Agievich and T.A. Yurasova

Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, 31-4, Leninsky prospect, 119071 Moscow, Russian Federation

Abstract: Al-Mg-Sc alloys have recently become promising materials for a number of industries (aircraft, automobile) due to their valuable qualities, such as high mechanical strength at low specific gravity, etc. Therefore, the efforts of the scientific community have been focused on their detailed study, which has largely concerned the mechanical strength characteristics of the material. The corrosion properties of these alloys have been studied in less detail, even for the alloy obtained by traditional metallurgical casting, and even less in detail for alloys obtained by additive manufacturing. This work is devoted to a detailed study of the corrosion (including biocorrosion) behavior of the Al-Mg-Sc alloy obtained by additive technologies. The corrosion behavior (including biocorrosion) of an Al-Mg-Sc alloy in corrosive electrolytes and in natural and artificial atmospheres has been studied. The alloy exhibits high resistance (exceeding that of pure aluminum) to the action of corrosive media. It was found that under the uniform corrosion conditions (electrolyte, atmosphere), the corrosion rate of the alloy does not exceed 1 μm/year, while if local (pitting) corrosion occurs, the corrosion rate is not large, either, and does not exceed 2 μm/year. The study of the corrosion behavior patterns of the Al-Mg-Sc alloy in environments inoculated with sulfate-reducing bacteria and six types of micromycetes: Trichothecium roseum, Richothecium roseum, Fusarium sambucinum, Aspergillus flavus, Aspergillus niger and Penicillium funiculosum was carried out. The inhibitory effect of the studied surface layers (containing vinyl and amino silanes and 1,2,3-benzotriazole) on corrosion in the presence of all the studied microorganisms was shown. It was found that the best corrosion inhibiting effect both on mycelial fungi and SRB-initiating microbiological corrosion is provided by the vinyl silane-based coating.

Keywords: uniform corrosion, localized corrosion, accelerated corrosion tests, biocorrosion, organosilanes, surface self-assembled organosilicon nanolayers, microbiological corrosion, corrosion inhibition, aspergillus niger, sulfur-reducing bacteria

Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 1900-1930
doi: 10.17675/2305-6894-2025-14-4-10

Download PDF (Total downloads: 14)

Back to this issue content: 2025, Vol. 14, Issue 4 (pp. 1685-... (in progress))