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topic 32205

Powder adhesion on red oxide surface and primer


A discussion started in 2003 but continuing through 2017

2003

Q. We have gear housings that in the past were red oxide on the inside to prevent any oil from leaking through the casting. I have been told that we can use powder coating to replace the red oxide and achieve the same or better results.

Is this correct?
Is powder coat impervious to all oils?

Brian Villareal
manufacturing / engineering - Durham, New Hampshire


High Performance Powder Coating
from Abe Books
or

A. Hi, Brian. Powder coat is not actually a material, it is an application method: finely powdered plastic is sprayed onto the parts, and sticks to it by electrostatic charge; the article is heated to melt/fuse the plastic into a coating on the article.

The point of making that distinction is that there are many different powders available, including epoxy, polyesters, nylons, vinyls, and teflons, and I'd be quite confident that -- with a supplier's help -- one can be chosen that will be completely resistant to the oils. Good luck.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"



2004

Q. Sir,

I wish to know that if the surface is covered with red oxide primer (ORDINARY,THAT IS USED IN WET PAINTING ALSO), will it be detrimental of beneficial to the quality of final coated product. In order to fill in small holes and crevices my customer fills in primer only on that area which is just a small portion of the piece, will I get fine results?

Thank you.

THIS IS TOO IMPORTANT FOR ME FOR MY CUSTOMER, PLEASE TRY TO REPLY AT THE EARLIEST. I SHALL BE VERY THANKFUL TO YOU.

RAHUL SHUKLA
metal crafts/powder coaters - BATALA, PUNJAB, INDIA


2004

A. "Red-oxide" primer will not be able to withstand temperatures of 180 to 220 °C encountered in any powder coating. With the primer failing at such temperatures, the top coat viz., powder coating, will also fail. Please consult your powder supplier and select a compatible primer which would enhance protection of the substrate even in the case of scratches and minor damage to the top coat. Also beware of some suppliers giving you "Gheru Mitthi" or saffron clay in the name of red oxide!

Srinivasan Subrahmaniyan
- Indore, M.P., India


2004

A. Please contact your supplier. There are pre coat powders available just as primer to wet painting. You need to coat the precoat powder at 180 degrees for a specific time depending on the thickness, and go for the required finish coat.

Jagathees
- Kuwait



Corrosion-resistant, paint-type finish for iron door-frames to be used by untrained manpower

2005

Q. We are a facility management company, principally looking after residential complexes. We are located at Bhiwadi, on Rajasthan-Haryana border. In last five years, this region has seen more than ample rain and this has given rise to a new problem in maintenance which is frequent rusting of door-frames. Needless to say, the problem is more severe in the ground floor houses. This has cost us several thousand rupees in last two years alone on several liters of paint and primer.

We are hoping to find a better solution than re-painting of door-frames, from companies with active R&D. Is there a coat/finish that can prevent corrosion for a period longer than three months and is as easy to apply as any normal paint? If yes, please inform us.

Thank you for your precious time. we do understand that as a consumer-level enquiry, this may not elicit much interest, but help from your industry would be a great one for our industry as a whole.

Thank you.

Ms Aradhana D [last name deleted for privacy by Editor]
(construction and maintenance of complexes) - Bhiwadi, Alwar, Rajasthan, India


2005

A. In Australia ,
Door frames of steel are usually hot dipped galvanized and they last for many many years , usually they require painting only when the colour of the house is changed , but the process is expensive .
A cheaper alternative would be Zinc Electroplate with a yellow chromate finish

John Tenison-Woods
John Tenison - Woods
- Victoria Australia


2005

A. The downside to the galvanizing or the electroplating is that you wouldn't be able to (at least, not economically) do it on-site. And certainly not with untrained manpower.

Try looking into Rust Converter [linked by editor to product info at Amazon] - these are paint-like products that convert the rust already present on the door into a very corrosion resistant and not horribly unattractive finish. If you search through the archives (or enter the following google search - "http://www.google.com/search?hl=en&q=site:www.finishing.com+rust+converter"), you should be able to find more information.

Good luck!

Jim Gorsich
Accurate Anodizing Inc.
supporting advertiser
Compton, California, USA
accurate anodizing banner


2005

A. Hello Aradhana;

The pretreatment of Mild Steel is rarely done well in India; most people use a powdered red oxide which is a powder that falls off the steel. When this red oxide powder is mistaken for a primer and directly painted upon; is where we go wrong.

You can't get down the line and stop this, so your best bet is to use Hot dip galvanised or zinc plated sections and use a zinc chromate primer before you paint.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

saify logo


March 5, 2009

Fundamentals of Powder Coating

A. Dear Aradhana,

We also face these problems. What I suggest is the newer Al and Zinc powder paint to be painted on the door frames. Being involved in this development work we have more solutions with different kind of products.

Take care

Prad

Pradeep Mittal
- New Delhi, Delhi, India



Enquiry for setup of red oxide plant and purchase of machinery required

March 16, 2008

RFQ: 1. What is the procedure for producing red oxide. How I will set up a plant of red oxide?
2. Where I will get the machinery ?
3. What is the cost of setting up a new plant?
4. Who deals in the machineries required for this plant?
5. How is the raw material purchased and transported ?
6. Where from is the raw material purchased?
7. What is the method of packing the finished material?
8. What is the end use of the finished Zinc Oxide?
9. Where in India do I contact for more information?

Kishore Bodempudi
Buyer - India
^- Sorry, this RFQ is outdated
     View Current RFQs




Distemper and coating

August 8, 2016

Q. i am student of chemical engineering recently I completed my BSC now I am interested in distemper, weather sheet, under coating (red oxide). I also try some batches but I want more good quality formulation for this please suggest me if any one has experience.
I shall be very thankful to you.
Thanks for the use of this site.

farhan ali
- pakistan

August 2016

? Hi Farhan. I have heard of the word "distemper" to mean "anneal" (sort of the opposite of 'temper') but I don't think that is what you are referring to.

I think 'distemper' is also a coating used on artistic paintings, but I am not familiar with what it actually is. We'll have to wait for a reader with a better understanding of the subject than me :-)

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"


August 9, 2016

A. When I was young - a very long time ago - distemper was the common name for water based domestic paint.
But we still have no idea what you are trying to achieve.

geoff smith
Geoff Smith
Hampshire, England



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