Re: Iron coating surface roughness

Posted by Gordon England ( on 13:42:08 28/02/05

In Reply to:Iron coating surface roughness posted by R. Pittier

: Hi,
: this seems to be a very helpful forum and I'd like to start a discussion on the following topics:
: - how to diminish surface roughness when plasma-spraying iron powder?
: - how to measure an iron coating on an aluminium substrate?
: I've been looking for an answer to the latter for a while... Eddy currents and ultrasonic measurements obviously don't work well because of the surface roughness (substrate thickness = 6-8 mm, coating thickness = 0.2-1 mm, roughness = 50-100 um), but I'm sure there IS a solution... I can't be the only one having this problem...
: I've been starting testings for the first question by varying the iron powder particle size and I'm waiting for the results. Is it the right parameter to work with?
: Thanks
: RP

Powder particle size will have probablly the largest effect on coating texture. The grit blast roughness can also be a factor on thin coatings.
Plasma spraying parameters can also effect texture, usually higher velocity produces finer texture.

Instruments based on eddy current are usually use for this type of coating/substrate combination. Magnetic type instruments if calibrated may be possible, although they are normally used for the reverse coating/substate combination.

Regards Gordon

Follow Ups:

Surface Engineering Forum

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Post A Message!

Gordon England Surface Engineering ForumPlease go to the new Surface Engineering Forum as this old message board is a read only archive. Please copy and paste relevant information or link to the page if you wish to reactivate a thread on the new forum.

Gordon England Independent Thermal Spray Coating Consultant
Telephone: +44 (0)1252 405186


Site Links


Nature of Thermal Spray Coatings

Surface Engineering in a Nutshell

Surface Engineering Forum

Thermal Spray Gun Repair Service

Plasma Consumable Parts

Thermal Spray Powder Supplies


Thermal Spray Coatings on Carbon and Glass Fibre Reinforced Polymers

HVOF Coating of Paper Making Roll

Abradable Coatings


Thermal Spray Processes:

Combustion Wire Thermal Spray Process

Combustion Powder Thermal Spray Process

Arc Wire Thermal Spray Process

Plasma Thermal Spray Process

HVOF Thermal Spray Process

HVAF Thermal Spray Process

Detonation Thermal Spray Process

Plasma Flame Theory

Cold Spray Coating Process

Wear and Use of Thermal Spray Coatings

Corrosion and Use of Thermal Spray Coatings

Glossary of Thermal Spray and Surface Engineering Terms

Image Directory for Thermal Spray Coatings

Plasma Gas Flow Information

Plasma Gas Flow Correction Calculator

Contact Form

Links to other interesting sites related to thermal spray and surface engineering

Reciprocal Links

Periodic Table of the Elements

SI Units

Calculators for Conversion between Units of Measurement

Hardness Testing

Surface Engineering Message Board Archive

Surface Engineering Message Board Archive Index

Photography Gallery2

Photography Gallery3

© Copyright Gordon England