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research-article

EFFECT OF SOYBEAN BIODIESEL ADDITION ON TRIBOLOGICAL PERFORMANCE OF ULTRALOW SULFUR DIESEL

[+] Author and Article Information
Salete Martins Alves

Federal University of Rio Grande do Norte, Av. Sen. Salgado Filho, Lagoa Nova, Natal/RN, Brazil. Zip code: 59072-970
saletealves@ect.ufrn.br

Aline Cristina Mendes de Farias

Federal University of Rio Grande do Norte, Av. Sen. Salgado Filho, Lagoa Nova, Natal/RN, Brazil. Zip code: 59072-970
alinecmfarias@yahoo.com

Valdicleide Silva Melo

Federal University of Rio Grande do Norte, Av. Sen. Salgado Filho, Lagoa Nova, Natal/RN, Brazil. Zip code: 59072-970
valdkqi@hotmail.com

José Josemar Oliveira Junior

Federal University of Rio Grande do Norte, Av. Sen. Salgado Filho, Lagoa Nova, Natal/RN, Brazil. Zip code: 59072-970
josemar@ect.ufrn.br

1Corresponding author.

ASME doi:10.1115/1.4041207 History: Received December 14, 2017; Revised August 08, 2018

Abstract

The purpose of this work was to study the influence of soybean biodiesel addition in ultra-low sulfur diesel on its tribological behavior under low-amplitude reciprocating conditions, simulating the operation of a fuel injector system. The methodology was divided into three parts: the first was the fuel preparation and its physicochemical characterization, where were studied four fuels (diesel, soybean biodiesel and mixtures of them).The following step was the evaluation of the fuel tribological properties, using the HFRR (High Frequency Reciprocating Rig) test. This tests were carried out by steel ball-on-disc lubricated contact, on which the friction coefficient of friction, the film percentage and the WSD (wear scar diameter) were measured, according to ASTM D6079-11. In the end, the analysis of the damages presented on the worn disc surfaces was characterized by SEM and AFM microscopic techniques. Results showed that the addition of biodiesel to ultra-low sulfur diesel is an excellent option to restore the lubricating ability of this fuel. The biodiesel incorporation reduces the friction coefficient and improves the film formation. Besides, the evaluation of worn disc surfaces using SEM and AFM techniques showed that biodiesel avoids damages to surface through protective film formation and reduces the superficial roughness.

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