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moonlight
Active Contributor

Join Date: Jul 2008
Posts: 17

coloring black

07/25/2008 7:14 AM

we do black color in plating but find that some part in some area not all over , turn reddish or reddish brown .can anybody send us the reason .
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pantaz
Commentator

Join Date: Feb 2008
Location: Van Nuys, CA
Posts: 97
Good Answers: 4
#1

Re: coloring black

07/25/2008 8:00 AM

What is the base material? What plating process?
moonlight
Active Contributor

Join Date: Jul 2008
Posts: 17
#3
In reply to #1

Re: coloring black

07/26/2008 7:45 AM

base material is c55 ie %of carbon is .50-.55% and the mangnese is .70-.90%

its a medium carbon steel. and we make assembly of cast and forge steel(same composition).color on the forge steel is black and cast steel is somewhere black somewhere reddish.
pantaz
Commentator

Join Date: Feb 2008
Location: Van Nuys, CA
Posts: 97
Good Answers: 4
#4
In reply to #3

Re: coloring black

07/26/2008 11:05 AM

Again, what process are you using to plate or color the metal?
TVP45
Guru
Engineering Fields - Engineering Physics - New Member

Join Date: Jul 2007
Location: Pittsburgh
Posts: 1626
Good Answers: 50
#2

Re: coloring black

07/25/2008 8:14 AM

Are you anodizing by chance?

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moonlight (1), pantaz (2), TVP45 (1)

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