Patent ID: 8839514

Claim:
A method for protecting at least one exhaust-gas-conducting surface region of an internal combustion engine or crankcase part against corrosion, the method comprising the following steps: machining at least one exhaust-gas-conducting surface region produced from a corrodible material using a surface-condition-changing machining tool; bringing the at least one exhaust-gas-conducting surface region into contact, during the machining, with at least one tribochemically activatable substance being activated during the machining; protecting the at least one exhaust-gas-conducting surface region against corrosion by forming a corrosion-resistant surface as a triboreaction layer with the respective surface region, by tribochemical reaction; carrying out the machining step by mechanically machining and changing the at least one exhaust-gas-conducting surface region with regard to surface condition using a mechanical machining tool as the surface-condition-changing machining tool; adding the tribochemically activatable substance as an additive to a lubricant and supplying the lubricant during the mechanical machining; and forming the tribochemically activatable substance of at least one metal silicate.