Influence of Nonionic Surfactant Hydrophobicity on the Tribological Properties of Microemulsion Systems Aimed at Cutting Fluid Applications
| Autor: | Erinéia da Silva Santos, Igor Micael Alves Uchôa, Ricardo Paulo Fonseca Melo, Francisco Wendell Bezerra Lopes, Alfredo José Ferreira da Silva, Lindemberg de Jesus Nogueira Duarte, Eduardo Lins de Barros Neto |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Materials Research, Vol 25 (2022) |
| Druh dokumentu: | article |
| ISSN: | 1516-1439 1980-5373 |
| DOI: | 10.1590/1980-5373-mr-2021-0584 |
| Popis: | Abstract The development of new environmentally-friendly cutting fluids is an important technological advancement. The aim of this study was to assess the tribological behavior of microemulsions (W/O) developed with epoxidized soybean oil and nonionic surfactants with different degrees of ethoxylation (NP4EO, NP6EO and NP9.5EO). The tribological performance of the microemulsion systems was assessed in a High Frequency Reciprocating Rig (HFRR) tribometer. Microemulsions showed Newtonian fluid behavior, with viscosities compatible with conventional cutting fluids. In addition, contact angle values above 90º indicate spherical-shaped drops on the surface on which they are deposited, due to their hydrophobic nature. The microemulsions formulated using surfactants with lower ethoxylation numbers and 20% concentration exhibited greater stability, lower viscosity and better friction reduction during tribological contact between surfaces, given that the average wear scar diameter was 118 µm with smooth surfaces exhibiting slight slippage wear caused by abrasion, as identified by SEM/EDS analyses. |
| Databáze: | Directory of Open Access Journals |
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