Effect of Acetic Acid on Wear Properties of Ferrous and Titanium-Based Materials under Ethanol Lubrication

Abstract

Disks of ferrous and titanium-based material were immersed and unidirectionally slid against a stainless steel pin in ethanol with or without acetic acid to evaluate the effect of acetic acid on wear. The disks were made of cast iron, stainless steel, titanium metal and particulate-reinforced titanium metal matrix composite sintered from mixed powder of Si 3 N 4 (5 mass%), TiN (10 mass%) and Ti (85 mass%). In the absence of sliding, the stainless steel, titanium and composite showed good corrosion resistance but the cast iron exhibited galvanic corrosion. With sliding, the addition of acetic acid to the ethanol increased the wear of the ferrous materials but had little effect on the titanium-based materials. Morphological and chemical analyses of the worn surfaces revealed that acetic acid promoted anodic dissolution of iron on the sliding surfaces of the ferrous materials in ethanol. The results also indicated that titanium and the composite in ethanol with and without acetic acid primary underwent mechanical wear and chemical wear, respectively. The composite exhibited good corrosion and wear resistance in ethanol regardless of the presence of acetic acid.

Material Removal Characteristics of Martensitic Stainless Steel in Acetic Acid Aqueous Solutions and in Acetic Acid Ethanolic Solutions

“…We previously investigated the wear properties of martensitic stainless steel SUS440C in ethanol (C 2 H 5 OH) with and without acetic acid (CH 3 COOH). 2) The wear volume of stainless steel in ethanol containing acetic acid was larger than that in ethanol alone. 2) The anodic dissolution caused by acetic acid promoted the wear of the stainless steel pin.…”

“…2) The wear volume of stainless steel in ethanol containing acetic acid was larger than that in ethanol alone. 2) The anodic dissolution caused by acetic acid promoted the wear of the stainless steel pin. 2) On the sliding surface of stainless steel in ethanol, metal oxides were formed.…”

“…2) The anodic dissolution caused by acetic acid promoted the wear of the stainless steel pin. 2) On the sliding surface of stainless steel in ethanol, metal oxides were formed. 2) Anodic dissolution inhibited the formation of metal oxides in ethanol containing acetic acid.…”

“…2) On the sliding surface of stainless steel in ethanol, metal oxides were formed. 2) Anodic dissolution inhibited the formation of metal oxides in ethanol containing acetic acid. 2) Metal oxides that form on machined surfaces damage the machining tools.…”

“…2) Anodic dissolution inhibited the formation of metal oxides in ethanol containing acetic acid. 2) Metal oxides that form on machined surfaces damage the machining tools. 3) Alumina (Al 2 O 3 ) cutting tools and abrasive grains have been used for the removal machining of stainless steels because Al 2 O 3 hardly reacts with iron.…”