| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1468375 | Corrosion Science | 2016 | 8 Pages |
•Main role of amines in oil/water metalworking emulsion was evaluated towards brass.•The amines were studied both in pure water and in the 5% oil/water emulsion.•Both the brass specimens and the oil/water emulsions were finely investigated.•Tertiary amines were found to be less corrosive than primary ones in water.•Cyclohexyldiethanolamine leads to stable lubricant emulsions limiting corrosion.
The influence of primary/tertiary amines in Oil-in-Water emulsions (as Metal Working Fluids (MWFs) towards brass) is evaluated in both pure water and 5% O/W emulsion. Physical properties, wetting, lubricating and corrosion behaviors are finely investigated. Experimental results show that the number of carbon atoms in amines plays a pivotal role in reducing the brass corrosion. Among the adopted amines, the cyclohexyldiethanolamine (CHDEA) seems to be the optimal one in both media: (i) it adsorbs easily onto the brass limiting corrosion and stain; (ii) it leads to stable emulsions; (iii) it does not affect the emulsion lubricant and wetting performances.
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