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Black Oxide Finish on High Tensile Fasteners

2007

I am not very clear regarding the terminology of Black Oxide Finish.

Whether this means the natural color which we can visually see

on heat Treated ( Heated to austinizing temperature , quenching in oil,

tempered down and quenched in water based oil solution ( Shell Dromus Oil )

to get this black coloring )

OR
Is it a separate process of immersion of the Heat Treated part as mentioned

in the above process in a hot alkaline solution to get the black oxide conversion coating ? ( Chemical Blackening )

V.V. Jambunathan
Product Development Engineer to meet customer requirement - Chennai, Tamil Nadu, India

Hello, V.V.,
Many words and phrases have multiple meanings that can only be derived from context. The phrase "black oxide" is widely used in accord your 2nd definition, but I don't know a way to validly claim that it cannot be used in accord with your 1st.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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