Effect of Nickel Acetyl Acetonate as Lubricant Additive in Base Oils with Different Molecular Structure on In-Situ Formation and Tribomechanism of Carbon-Based Tribofilms of Steel-Steel Sliding Pair

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-04-25 DOI:10.1007/s11249-024-01859-z
Feng Peng, Shuguang Fan, Ningning Song, Chuanping Gao, Shengmao Zhang, Yujuan Zhang
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Abstract

Nickel acetyl acetonate (Ni(acac)2), a metal-organic compound, was directly dispersed in base oils alkylated naphthalene (AN-5), diisooctyl sebacate (DIOS), poly-α-olefin (PAO6), and mineral oil (liquid hydrocarbon mixtures:150 N) in the presence of commercial dispersant RF1151 (monoallyl poly(isobutylene succinimide). The tribological properties of the lubricants were tested with a four-ball friction and wear tester. The friction-induced in-situ formation of carbon films on rubbed steel surfaces under the catalysis of Ni(acac)2 was investigated, and the as-formed carbon films were characterized by scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that Ni(acac)2 added in the base oils can decompose to form metallic nickel to form nickel layer on the rubbed metal sub-surfaces and catalyze the degradation of the base oil molecules adsorbed to form carbon-based tribofilms. The carbon film formed from AN-5 with aromatic ring structure has a high degree of graphitization and the best friction-reducing and antiwear abilities, and those formed from PAO6 and 150 N with linear structure have a low degree of graphitization as well as good tribological properties. Under the lubrication of DIOS with Ni(acac)2, however, there is no carbon film formation while the tribological properties of the lubricant are relatively poor, due to the absence of the catalytic metallic nickel and nickel oxide layer on the rubbed metal sub-surface. Thanks to the catalytic effect of metallic nickel released from Ni(acac)2 for the degradation of various base oils with different molecular structure, the present approach could provide a rational pathway to tune the in-situ formation of carbon-based tribofilm on rubbed steel surfaces so as to effectively reduce the friction and wear of steel-steel sliding pair.

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在不同分子结构的基础油中加入乙酰丙酮酸镍作为润滑油添加剂对钢材-钢材滑动对碳基三膜原位形成和摩擦机理的影响
在商用分散剂 RF1151(单烯丙基聚异丁烯琥珀酰亚胺)的作用下,将金属有机化合物乙酰丙酮酸镍(Ni(acac)2)直接分散在基础油烷基化萘(AN-5)、癸二酸二异辛酯(DIOS)、聚α-烯烃(PAO6)和矿物油(液态烃混合物:150 N)中。使用四球摩擦磨损测试仪测试了这些润滑剂的摩擦学特性。研究了在 Ni(acac)2 催化下摩擦引起的摩擦钢表面碳膜的原位形成,并通过扫描电子显微镜、拉曼光谱和 X 射线光电子能谱对形成的碳膜进行了表征。结果表明,基础油中添加的 Ni(acac)2 可以分解形成金属镍,在摩擦的金属亚表面形成镍层,并催化吸附的基础油分子降解形成碳基三膜。由芳香环结构的 AN-5 形成的碳膜石墨化程度高,减摩抗磨能力最强,而由线性结构的 PAO6 和 150 N 形成的碳膜石墨化程度低,摩擦学性能良好。然而,在使用 Ni(acac)2 的 DIOS 润滑条件下,由于被摩擦金属次表面没有催化的金属镍和氧化镍层,因此没有形成碳膜,润滑剂的摩擦学性能也相对较差。由于从 Ni(acac)2 中释放出的金属镍对降解不同分子结构的各种基础油具有催化作用,因此本方法可以提供一种合理的途径来调节摩擦钢表面碳基三薄膜的原位形成,从而有效降低钢-钢滑动副的摩擦和磨损。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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