Before revision: Sheet metal forming, thread manufacturing and other industrial operations may include moving parts or contact surfaces made of stainless steel, aluminium, titanium, and other metals whose natural development of an external oxide layer through passivation increases their corrosion resistance but renders them particularly susceptible to galling.
After revision: ,,Sheet metal forming, thread manufacturing and other industrial operations may include moving parts or contact surfaces made of stainless steel, aluminium, titanium, and other metals whose natural development of an external oxide layer through passivation increases their corrosion resistance but renders them particularly susceptible to galling.