Cleaning before coating

[adamant]

Hello!

Can anybody give me some advice on cleaning?
In case of some extremely oily, greasy or otherwise soiled engine parts with rough surfaces, my coatings keep peeling of after deposition.
I have tried cleaning with benzine, an industrial washing machine, ultrasonic baths

and different commercial purifiers.

Do I need some special etching process?
What kind of process do you recommend? What parameters? Which cleaning agents might be best?

Thanks for any help!

 

[unclesyd]

What are the parts made from?

Benzene, if you are talking about the chemical, is a poor choice for cleaning as it is potent carcinogen.

 

[adamant]

E.g. we have 16MnCrS5 parts. It seems to be a problem concerning embedded oil in the surface because of the surface grounding process.
Thus I started a similar thread in the Materials Engineers / Paint/Coating engineering forum.