Chemistry Reference
In-Depth Information
6
Metal Soap Greases
Esen Ark×ü and Devrim Balk|se
CONTENTS
6.1 Introduction ....................................................................................................... 55
6.2 Lubrication of Polymer-metal Contacts ............................................................ 57
6.2.1 Polyolefins ............................................................................................... 57
6.2.2 Polyvinyl Chloride (PVC) ....................................................................... 57
6.3 Lubrication of Metal-Metal Contacts ................................................................ 58
6.4 Grease Types...................................................................................................... 59
6.4.1 Powder Form Greases.............................................................................. 59
6.4.2 Single Soap Greases ................................................................................ 59
6.4.3 Mixed Soap Greases ................................................................................ 61
6.4.4 Complex Soap Greases ........................................................................... 61
6.5 Aqueous Lubricants and Phase Diagram of Soaps in Water ............................. 63
6.6 Greases with Different Base Oils: Mineral Oil and Vegetable Soybean Oil .... 64
6.6.1 Thermo-oxidative Stability and National Lubricating Grease Institute
(NLGI) Hardness ............................................................................................... 66
6.7 The Effect of Composition on Rheology in Rolling Contact with Lithium and
Alluminum Complex Greases ........................................................................... 71
6.8 Additives in Greases.......................................................................................... 72
6.8.1 Tribological Investigation of CAF2 Nanocrystals as Grease Additive ... 73
6.9 Conclusion ......................................................................................................... 73
Keywords ................................................................................................................... 74
Acknowledgment ....................................................................................................... 74
References .................................................................................................................. 74
6.1 INTRODUCTION
Metal soaps are transition metal salts of the fatty acids and the alkaline earth. Although,
the alkali salts of the fatty acids such as sodium and potassium are water soluble,
metal soap is water insoluble but more soluble in nonpolar organic solvents [1]. Some
commercially important metal soap include those of Alluminum, barium, cadmium,
calcium, cobalt, copper, iron, lead, lithium, magnesium, manganese, potassium, nickel,
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