Coadyuvantes de pH alcanolamínicos, emulsificantes y amortiguadores inorgánicos para fluidos de corte solubles en agua — monoethanolamine, triethanolamine y boric acid — suministrados a granel.
Las aminas para fluidos de metalmecánica son alcanolaminas que mantienen un fluido de corte o de rectificado soluble en agua al pH correcto mientras cumplen varias funciones a la vez: amortiguar la deriva ácida, emulsificar el aceite en agua y proteger el metal ferroso de la oxidación instantánea (flash rust). Monoethanolamine (MEA, CAS 141-43-5) is the strong, low-cost pH and reserve-alkalinity builder; triethanolamine (TEA, CAS 102-71-6) adds emulsification and yellow-metal-friendly corrosion control. Target a working pH near 8.8-9.2 for most soluble fluids and dose the amine to hold it as the sump ages.
The genuine trade-off is chemical, not commercial. Alkanolamines give a sump long life and good corrosion protection, but with a nitrosating agent present, most often a nitrite-based corrosion inhibitor, secondary-amine content can form N-nitrosamines, a documented metalworking-fluid concern flagged by NIOSH. Primary amines such as MEA form unstable nitroso species; residual diethanolamine in a tertiary-amine grade is the principal precursor. Do not combine nitrite inhibitors with amine-based fluids, and confirm regulatory status for your application and jurisdiction.
Boric acid (CAS 10043-35-3) rounds out the group as an inorganic pH buffer and reserve-alkalinity aid, not an amine, and provides the mild biocidal action that helps hold sump pH and limit spoilage. Keep total water hardness in view, because hard make-up water shifts both pH and emulsion stability. Monitor pH and refractometer concentration weekly, and top up the amine package before pH falls below about 8.5 rather than after corrosion appears.
Utilizamos cookies y tecnologías similares con fines analíticos y para mejorar nuestro sitio y — con su consentimiento — para marketing e identificación de visitantes B2B. Elija qué desea permitir. Consulte nuestra Política de Privacidad.