Nitrite Engine Valve

Nitration is hardening process of coating nitrite on the engine valve which will appear as black valve. Compared to stainless steel base material the micro hardness is higher having high ductility property beneath the nitrated layer. The nitrite coating increases the deterioration and corrosion resistance. The Black Nitrite applies to the whole valve and the nitrite layer is stick to the base material at a microscopic level, so the valve does not break when in bend due to impacts with the pistons. Nitration processed on valve decreases stickiness and this features lengthen valve durability.