The coatings we apply are not only subject adherence to strict quality controls for coating integrity, but the customers demand a perfect cosmetic appearance (almost more important for the less educated customer). Is there a "clear coat" that can be applied to prevent "dirty finger prints" from staining the TBC coating?

Hi BQuinn

to the Surface Engineering Forum.

A clear silicone sealer may be worth consideration, but I think you will need get approvals to use it first. In heat of service the sealer will breakdown leaving traces of silicates in the coating - effects of which will need to be evaluated.

Hi BQuinn,

We used to apply TBC to RR engine turbine vanes. If I recall correctly we use to heat tint to burn of dirty prints (560oC 30 minutes) ... I think..
Tippex is good stuff too

Jim

Jim,
Thanks. We also run our parts in an atmospheric gas fired furnace - not sure of temperature or duration. This treatment would "even out" any of the tiger striping - not sure how well it works for us with dirty prints. What is Tippex?
Bob

TurbineRepair Wrote:Hi BQuinn,

We used to apply TBC to RR engine turbine vanes. If I recall correctly we use to heat tint to burn of dirty prints (560oC 30 minutes) ... I think..
Tippex is good stuff too

Jim

Bob,
Tippex is a correcting fuild for covering up errors with pen ink - I was being facetious Though I have known black marker pen used for touching up sermaloy J coatings on turbine vanes.... and blades!

Jim

TurbineRepair Wrote:Bob,
Tippex is a correcting fuild for covering up errors with pen ink - I was being facetious Though I have known black marker pen used for touching up sermaloy J coatings on turbine vanes.... and blades!

Jim

TurbineRepair Wrote:Bob,
Tippex is a correcting fuild for covering up errors with pen ink - I was being facetious Though I have known black marker pen used for touching up sermaloy J coatings on turbine vanes.... and blades!

Jim

tricks of the trade. Enforcing the use of gloves for handling parts. Finger prints will be recorded in the offenders/crime register Seriously, though it is a quality issue the workforce need to take on board.