Tratamento superficial de armamento leve do Exército Brasileiro: Estudo da influência das variáveis da operação de fosfatização

Marco Aurélio Milagres Peixoto; Caroline Jovine Bouças Guimarães; Amanda Luiza Bezerra Sandes  Martins; Fernando Cunha Peixoto; Álvaro José Boareto Mendes

doi:10.14295/vetor.v30i2.12974

Authors

Marco Aurélio Milagres Peixoto Instituto Militar de Engenharia
Caroline Jovine Bouças Guimarães Centro Tecnológico do Exército
Amanda Luiza Bezerra Sandes Martins Centro Tecnológico do Exército
Fernando Cunha Peixoto Instituto Militar de Engenharia https://orcid.org/0000-0003-1506-9548
Álvaro José Boareto Mendes Instituto Militar de Engenharia https://orcid.org/0000-0003-1432-9045

DOI:

https://doi.org/10.14295/vetor.v30i2.12974

Keywords:

Manganese phosphating, Variables of the reactional system, Evaluation of the variables influence

Abstract

The present paper aims to investigate the effects of three variables of the reactional system that take place in the manganese phosphating process by hot immersion used in Brazilian Army light armaments. The evaluation of the influence of these variables was carried out with a factorial experimental design with two levels for three variables, namely time, phosphating reagent concentration and ferrous ions concentration in the reaction enviroment. The results showed that the selected variables have significant interaction effects, so they must be evaluated together. It was concluded that: (1) time is important, especially for the mass gain of the coating and for refinement of the crystals; (2) the phosphating reagent concentration proved to have high impact on the well-defined crystallization of coatings, on the contribution of manganese in crystals and on obtaining higher weight layers; (3) the ferrous ions concentration contributed to the appearance of coarser granulations.

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