Talking about the microbial hazard of waterborne metalworking fluid
Talking about the microbial hazard of waterborne metalworking fluid
First, the characteristics of water-based metalworking fluid
1. Alkaline pH: 8-9.5 Although it is not the most suitable pH for microorganisms, mass reproduction is not affected.
2. temperature: its low temperature is enough to support the growth and reproduction of microorganisms, not high enough to inhibit microbial growth
3. usually contains higher water
4. the component contains sufficient nutrition
5. recycling, while bringing in oxygen is conducive to microbial reproduction
6. the flow rate is not enough to resist the formation of biofilm
7. carrying waste, self-contamination
Second, common microorganisms in aqueous metalworking fluid
bacterial:
Anaerobic bacteria (commonly known as sulfuric acid reducing bacteria, producing hydrogen sulfide, etc.)
Aerobic bacteria such as Escherichia coli, Pseudomonas, Staphylococcus aureus, Bacillus subtilis, etc.
Fungus
Mold: Aspergillus, Penicillium, Rhizopus oryzae, Cephalosporium, etc.
Yeast: red yeast, brewer's yeast, candida, etc.
Third, the three major hazards of microorganisms on metalworking fluids
Metalworking fluids, especially water-based metalworking fluids and emulsions, are fertile breeding grounds for microbial growth
(1) In the course of use, if they are allowed to grow and reproduce without limitation, it will cause the processing fluid to spoil and deteriorate, and reduce the performance of the metalworking fluid
(2) Corrupted processing fluid will damage the processing machine, block the processing fluid processing system, damage the machining tool and machine the workpiece;
(3) The growth and reproduction of microorganisms can cause malodors and corresponding compounds that affect the environment of the factory, stimulate the skin of the operator and cause allergic reactions, and endanger the health of workers.
Fourth, the specific problems brought by microorganisms to metalworking fluids (water-based)
1. The working fluid is stinky, discolored, and turbid
2. The emulsified state is unstable, oil and water separation
3. Metal surface or fuel tank has sticky deposits, block the oil circuit or filter
4. The pH value drops
5. Corrosion of equipment
6. The trend of increasing foam
7. The cutting ability is reduced
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