Tribological performance of ammonium thiomolybdate as water-soluble lubricant additive for steel-steel contacts

IF 1.8 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2022-12-26 DOI:10.1002/ls.1637

Javier Lara-Romero, Ricardo Rangel, Julián López-Tinoco, Jesús Antonio Carlos-Cornelio, Alejandro Toro-Betancur, Fernando Chiñas-Castillo, Gabriel Alonso-Nuñez, Sergio Jiménez-Sandoval

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Abstract

The friction and wear reducing properties of ammonium thiomolybdate as a water-soluble lubricant additive were evaluated using a pin-on-disck tribometer on a steel-steel contact. The tribological performance of aqueous solutions of thiomolybdate prepared at concentrations between 0.1 and 0.3 wt% Mo were evaluated at the same load (10 N), entrainment speed, sliding distance and temperature. Although there is a reduction of friction and wear compared with pure water, a significant difference is observed, depending on the additive concentration. SEM/EDAX and Raman spectroscopy analyses of the wear tracks of specimens tested at concentrations below 0.3 wt% Mo reveal the formation of FeS which is responsible for gradually reducing the coefficient of friction from values between 0.30 and 0.5 down to ~0.11. At 0.3 wt% Mo, the analyses indicated the formation of a MoS₂ which keeps the coefficient of friction in ~0.05, the lowest recorded value.

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水溶性润滑添加剂硫代钼酸铵的摩擦学性能

使用销盘式摩擦计在钢-钢接触面上评估了硫代钼酸铵作为水溶性润滑剂添加剂的摩擦和减磨性能。在相同的负载（10N）、夹带速度、滑动距离和温度下，评估了在0.1-0.3wt%Mo浓度下制备的硫代钼酸盐水溶液的摩擦学性能。尽管与纯水相比，摩擦和磨损有所减少，但根据添加剂浓度的不同，观察到了显著的差异。在低于0.3wt%Mo的浓度下测试的试样的磨损轨迹的SEM/EDAX和拉曼光谱分析揭示了FeS的形成，其导致摩擦系数从0.30和0.5之间的值逐渐降低到约0.11。在0.3wt%的Mo下，分析表明形成了MoS2，其将摩擦系数保持在约0.05，这是最低的记录值。

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来源期刊

Lubrication Science ENGINEERING, CHEMICAL-ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

10.50%

发文量

审稿时长

6.8 months

期刊介绍： Lubrication Science is devoted to high-quality research which notably advances fundamental and applied aspects of the science and technology related to lubrication. It publishes research articles, short communications and reviews which demonstrate novelty and cutting edge science in the field, aiming to become a key specialised venue for communicating advances in lubrication research and development. Lubrication is a diverse discipline ranging from lubrication concepts in industrial and automotive engineering, solid-state and gas lubrication, micro & nanolubrication phenomena, to lubrication in biological systems. To investigate these areas the scope of the journal encourages fundamental and application-based studies on: Synthesis, chemistry and the broader development of high-performing and environmentally adapted lubricants and additives. State of the art analytical tools and characterisation of lubricants, lubricated surfaces and interfaces. Solid lubricants, self-lubricating coatings and composites, lubricating nanoparticles. Gas lubrication. Extreme-conditions lubrication. Green-lubrication technology and lubricants. Tribochemistry and tribocorrosion of environment- and lubricant-interface interactions. Modelling of lubrication mechanisms and interface phenomena on different scales: from atomic and molecular to mezzo and structural. Modelling hydrodynamic and thin film lubrication. All lubrication related aspects of nanotribology. Surface-lubricant interface interactions and phenomena: wetting, adhesion and adsorption. Bio-lubrication, bio-lubricants and lubricated biological systems. Other novel and cutting-edge aspects of lubrication in all lubrication regimes.