炭素数の異なるカルボン酸の塗布によるアルミニウムの切削抵抗の減少

抄録

It is known that organic substances such as oleic acid (C₁₈8H₃₄O₂) coated on work-hardened metal surface affect the decrease of cutting force and surface roughness. According to our FTIR measurement, it is presumed that these coating effects are caused by the chemisorption of oleic acid molecules to metallic atoms near dislocation. In the present research, two groups of coating materials are examined, that is, 1) liquid paraffin or ethanol containing 0.2mass% organic substances of the number of carbon being 18 (C₁₈H₃₈, C₁₈H₃₆O₂, C₁₈H₃₅O₂Na and C₁₈H₃₈O), and 2) liquid paraffin containing 0.2 or 100mass% carboxylic acid (CxH₂xO₂, x:2-18). Cutting speed and depth are 1.67mm/s and 0.02mm, respectively. The following results were obtained. 1) Cutting force is decreased by coating of 0.2mass% carboxylic acid of x??7. 2) Surface roughness were drastically improved by the coating of organic substances which the number of carbon is more than 12. 3) Cutting force is always decreased by coating of 0.2mass% organic substances of x=18 with the polarity (C₁₈H₃₆O₂, C₁₈H₃₅O₂Na and C₁₈H₃₈O).