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What are electronics cutters coated with?

Shop for Electronic Cutters

Phosphorous acid, used for giving phosphate conversion coatings to electronics cutters Some electronics cutters have phosphate conversion coatings. This means that a mixture of phosphate salts and phosphoric acid has been sprayed onto the metal components of the electronics cutters to create an insoluble coating that resists rust and corrosion.
Electronics cutters can be bought with softer outer coatings for cutting jewellery and musical strings Electronics cutters are also available with softer outer coatings of aluminium or brass, specifically for applications like repairing musical instruments or making items of jewellery, where it is important to avoid scratches and other surface damage.