Biocides in metalworking fluids

Abstract

Metalworking fluids and coolants are used in various metalworking operations in many large factories, but also in small workshops. They are formulated not only to fulfill its basic functions, but also to be safe for environment and people that are exposed to its effect during work. One of the most common complications during use of MWF is its microbial degradation, because they are subject to impureness with bacteria and fungi, since they contain all nutritients needed for development and growth of microorganisms. That's why control and monitoring of microorganism's growth are key factors in maintenance of MWF during use, and even during resting time, until its lifetime ends. The addition of biocides contributes significantly to maintaining the quality of MWF, by protecting it from growth of potentially harmful microorganisms which could induce health problems with workers, but also affect the quality of processing and lifetime of MWF. In this paper one can find results of analyses of emulsions that are treated with biocides of different chemical composition after microbial degradation, in very high and very low exploitation temperatures.