Metal deactivators are an important additive in lubricating oil formulations, especially with the growing use of non-ferrous metals, notably copper- and aluminium-containing alloys, that can be prone to the negative effects of staining and corrosion. The ions of these metals are also catalytically active and act as reaction sites that can trigger lubricant degradation through oxidation of the base oil.
Metal deactivators belong to the corrosion-inhibitor class of additives, and work their magic on metal surfaces, especially non-ferrous metals, and also on wear particles that are dissolved or suspended in the oil. These specialised additives contain surface-active molecules that adsorb on metal surfaces. The mechanism for how they function involves the formation of an inactive barrier film that inhibits cathodic and/or anodic reactions that can accelerate oxidation and cause corrosion.
Metal deactivators are typically organic compounds that contain nitrogen or sulphur atoms. These atoms have a high affinity for metal ions and can form strong, stable bonds with them. This allows the additives to neutralise or deactivate these metal ions in the oil, which reduces their negative effects.
Lubricant blenders add metal deactivators to oils, primarily to protect copper and yellow metals in most automotive and industrial lubricants, including greases and metal-working fluids.
The protective film that metal deactivators form on a metal surface is also thermally stable, water insoluble and chemically bonded.
Novel bearing steel next generation of aeroengines SKF South Africa
Motion Control & Drives
SKF continues to re-imagine intelligent and clean rotation with the development of an innovative temperature-resistant, corrosion-tolerant steel called ARCTIC15 designed for aeroengine bearings.
Read more...Why AI will never truly understand machines Wearcheck
IT in Manufacturing
Cutting-edge technology and solutions powered by AI are embraced by specialist condition monitoring company, WearCheck, where the extreme accuracy of data used to assess and diagnose machine health is paramount.
Read more...Products from maxon
Motion Control & Drives
A wide range of new products is available from motion control specialist, maxon. with a diverse technology portfolio ranging from highly integrated robotic actuators to powerful servo drives and controllers.
Read more...Actuators for precise hexapod movements
Motion Control & Drives
Aerotech, manufacturer of high-performance motion control and automation systems, is expanding its Automation1 platform. These compact hexapod devices enable the complete integration of six-axis motion systems into existing control
Read more...Precision in every drop, powered by ICP technology Wearcheck
Analytical Instrumentation & Environmental Monitoring
Elemental profiling using Inductively Coupled Plasma – Optical Emission spectroscopy provides useful information on the chemical composition of lubricants.
Read more...Precision meets performance: The ELGD Axes Family from Festo Festo South Africa
Motion Control & Drives
Festo has introduced the ELGD axes family, engineered for the demands of future-focused industries. With cutting-edge guide technology, exceptional rigidity and high load capacity, these axes deliver more performance within the same installation footprint.
Read more...Condition monitoring in hazardous areas SKF South Africa
Motion Control & Drives
SKF is further strengthening its condition monitoring offer portfolio by a newly developed hazardous area version of its Microlog Analyzer dBX portable vibration analyser.
Read more...Rip-and-ship solution speeds up nuclear decommissioning project
Motion Control & Drives
When removing steam generators from decommissioned nuclear reactor buildings, the most economical method is to remove them in one piece. Mammoet was commissioned by Framatome to support with the removal of four steam generators from PreussenElektra’s Nuclear Power Plant Unterweser in Germany.
Read more...WearCheck turns the focus on friction modifiers Wearcheck
Motion Control & Drives
One of the most important features of a lubricant is the reduction of friction between two surfaces.A dditives like friction modifiers are added to perform this function. Wearcheck turns the focus on friction modifiers
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version