盐溶液条件对边界润滑添加剂在带电表面吸附行为的影响

doi:10.3901/JME.2021.09.118

机械工程学报 ›› 2021, Vol. 57 ›› Issue (9): 118-126.doi: 10.3901/JME.2021.09.118

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盐溶液条件对边界润滑添加剂在带电表面吸附行为的影响

吴波^1,2, 古乐³, 曹华军^1,2, 渠达^1,2

1. 重庆大学机械与运载工程学院重庆 400044;
2. 重庆大学机械传动国家重点实验室重庆 400044;
3. 哈尔滨工业大学机电工程学院哈尔滨 150001

收稿日期:2020-07-11 修回日期:2020-12-08 出版日期:2021-05-05 发布日期:2021-06-15
通讯作者: 渠达(通信作者)，男，1987年出生，博士，助理研究员。主要研究方向为难加工材料的精密/超精密加工与高速干切。E-mail：bennyqu007@yahoo.com
作者简介:吴波，男，1987年出生，博士，助理研究员。主要研究方向为摩擦学和表面工程，包括表/界面力(如空间位阻力、双电层力、水合力)、高分子吸附、黏着/黏附、边界润滑、固体润滑、功能涂层/薄膜等。E-mail：obouwu@hotmail.com;古乐，男，1975年出生，博士，教授，博士研究生导师。主要研究方向为摩擦学、表面工程和轴承技术。E-mail：gule@hit.edu.cn;曹华军，男，1978年出生，博士，教授，博士研究生导师。主要研究方向为绿色制造系统工程、高能效绿色制造工艺及装备和切削摩擦学。E-mail：hjcao@cqu.edu.cn
基金资助:
国家重点研发计划（2018YFB2002201，2018YFB2000300）资助项目。

Effect of Salt Solution Condition on Adsorption Behaviors of Boundary Lubrication Additive on Charged Surfaces

WU Bo^1,2, GU Le³, CAO Huajun^1,2, QU Da^1,2

1. College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044;
2. State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044;
3. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001

Received:2020-07-11 Revised:2020-12-08 Online:2021-05-05 Published:2021-06-15

摘要/Abstract

摘要： 为揭示盐溶液条件对边界润滑添加剂聚醚接枝聚羧酸盐（Poly （carboxylate ether），PCE）吸附行为的影响，利用表面力仪在一种商业PCE的多种水溶液中直接测量带电云母表面之间的法向作用力。力—距离测量表明PCE从0.1 mol/L K₂SO₄溶液中微弱地吸附于云母表面，其边界吸附薄膜（厚度约50Å）在相当于三四个大气压的载荷条件下即从两表面间完全挤出。解吸附之后，PCE能立即实现相同的再吸附。在相同离子强度的0.1 mol/L Ca （NO₃）₂溶液中，PCE却不吸附于云母表面。但是，在低浓度的5 mmol/L Ca （NO₃）₂溶液中，PCE在云母表面建立厚度约40Å的牢固边界吸附层。二价Ca²⁺离子能桥接两PCE边界吸附层，而单价的K⁺离子不能。二价阳离子桥接吸附机理只能在有限的离子浓度范围内发生。

关键词: 吸附, 边界润滑添加剂, 聚醚接枝聚羧酸盐, 盐条件, 表面力仪

Abstract: To reveal the effect of salt solution condition on adsorption behaviors of boundary lubrication additive poly(carboxylate ether) (PCE), normal interaction forces are directly measured between charged mica surfaces in multiple aqueous solutions of a commercial PCE by a surface forces apparatus. Force—distance measurements indicate that the PCE weakly adsorbs onto mica from 0.1 mol/L K₂SO₄ and its boundary adsorption layers (about 50 Å thick) are totally squeezed out from the surface gap under an equivalent load level of three to four atmosphere pressures. The PCE is able to immediately accomplish the same adsorption after desorption. In the same ionic strength condition of 0.1 mol/L Ca(NO₃)₂, the PCE does not adsorb onto mica. However, the PCE builds up a 40-angstrom-thick robust adsorption layer on mica in the low calcium solution of 5 mmol/L Ca(NO₃)₂. Divalent Ca²⁺ ions are able to bridge adsorbed PCE layers while monovalent K⁺ ions unable. The divalent cation bridging adsorption mechanism only functions in a finite ion concentration range.

Key words: adsorption, boundary lubrication additive, poly(carboxylate ether), salt condition, surface forces apparatus

中图分类号:

TH117

吴波, 古乐, 曹华军, 渠达. 盐溶液条件对边界润滑添加剂在带电表面吸附行为的影响[J]. 机械工程学报, 2021, 57(9): 118-126.

WU Bo, GU Le, CAO Huajun, QU Da. Effect of Salt Solution Condition on Adsorption Behaviors of Boundary Lubrication Additive on Charged Surfaces[J]. Journal of Mechanical Engineering, 2021, 57(9): 118-126.

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盐溶液条件对边界润滑添加剂在带电表面吸附行为的影响

Effect of Salt Solution Condition on Adsorption Behaviors of Boundary Lubrication Additive on Charged Surfaces

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