Notes: Nitrite Based Corrosion Inhibitors
Nitrite based corrosion inhibitors provide good corrosion protection by a protective barrier film that is formed by a chemical reaction between nitrite and iron or aluminum. This works fine in a closed system like a radiator as long as there is very little air entry into the reservoir. However, continuous air entry via surface air-to-liquid contact into the reservoir of a CNC Plasma Arc Water Table, including pumping of the liquid in open air, will oxidise the nitrite to the ineffective nitrate form which is a carcinogen. Net result is a corrosive nitrate liquid that attacks the metal or aluminum material in the reservoir. It should be noted that Nitrites are known for their corrosive assault on copper and bronze.
Proprietary nitrite based corrosion inhibitors; such as supplied by Koal Industries as Plasma Quench 617, usually consist of an aqueous solution of sodium nitrite, a pH buffer, and a biocide (formaldehyde).
Nitrites have temperature limitations when used in Plasma Arc Cutting water tables as well. Testing in sodium nitrite cutting water tables has shown abnormally high sodium content in relation to the nitrite. The nitrite is changing into nitrate due to excessive air absorption and thermal breakdown by the plasma arc torch heat. This heat causes gassing-off of the Nitrite/Nitrate with resultant toxic fumes, and the Sodium remains. The result is increased corrosivity in the bath. If the Plasma Arc Operator adds more Sodium Nitrite to alleviate this corrosion problem, he will in fact worsen the condition substantially.
Sodium nitrite is an active nutrient for bacteria resulting in a high demand for formaldehyde containing biocides, which has a very negative environmental impact, causing severe health problems including cancer, respiratory and visual. Disposal of sodium nitrites in any concentration causes serious environmental issues.
Because of its high concentration in the reservoir with the resultant high Total Dispersed Solids, sodium nitrites cause extra wear on pump and valve seals.
GreenCut Cutting/Misting Fluid
does NOT contain Nitrites, or any biocides or pesticides for bacterial control in its formula. GreenCut is totally safe for humans, animals, fish, land, air, and water. GreenCut is proven and certified under the international EcoLogo CCD-069.
GreenCut Cutting Fluid will improve machining operations of all metals and alloys by at least 40%, when used at a mix ratio of 1:20 with tap water. GreenCut contains superior metal-cutting chemistry together with anti-rust and anti-foam additives, all of which is SAFE and 100% effective. Used GreenCut Cutting Fluid is approved for direct sewage disposal after waste metals removal.
GreenCut is easy on the hands and helps heal lacerations and dermatitis. The GreenCut vapors won't cause asthma or breathing problems and will not cause cancer.
GreenCut eliminates the food source for all bacterium in the metalworking fluid reservoir by instant biodegradation of any oils dripping into the reservoir. The tramp oils are immediately biodegraded to CO2, water and protein biomass, providing a totally safe environment while removing all sump odors.
