1、 Oxidation reaction between material and cutting fluid in aluminum alloy ；

　　 Low plasticity of aluminum alloy ， Melting point is also low. ， Good thermal conductivity ， If the lubricity and coolability of cutting fluid are not up to standard when processing aluminum alloy ， Will lead to Aluminum processing Sticking knife ， Poor chip removal performance ， Such a cycle ， Tool corroded ， The chance of breaking the knife is greatly increased ， Next, when processing aluminum ， It depends on the composition of magnesium and silicon in it ， If magnesium has more ingredients ， It's easy to separate soap ， At the moment, the cutting fluid for machining is easy to lose its lubricating effect ， It can also lead to knife breakage 。 Meanwhile ， Aluminum alloy is a sensitive amphoteric metal ， Easy to form chemical reaction in air ， Oxidation occurs 。

　　2、 Cutting fluid corrodes aluminum parts 。

　　 White spot is the lack of cleaning power of cutting fluid ， Residual cutting fluid on the part surface 。 Meanwhile Cutting fluid pH Value is also critical ，pH Too high value will corrode the workpiece ，pH Too low value causes bacteria to multiply in large quantities, which affects the stability and performance of cutting fluid 。

　　 Oxidized aluminum parts shall be used ： Special cutting fluid for aluminum alloy PH The value must be 8.5-9.5 Between ， In addition ， More stringent in the selection of dilution water ， Because many ions in water are corrosive to aluminum ， If the water content of these ions is too high, the rust resistance of cutting fluid will be reduced ， Especially in the process of rust prevention ， For example, chloride ion 、 Sulfate ion and heavy metal ion 。 Choose dilution water with lower hardness as much as possible ， Or diluted water softened by ion exchange ， To ensure the use and service life of cutting fluid 。