AUTOPHORETIC COATING PROCESS PDF

Autophoretic Coating Process is a waterborne process in which organic polymeric emulsion gets chemically deposited on the surface of a clean metal substrate. Basics of Autophoretics: Also known as autodeposition, A-coat or AP. It is a waterborne process which depends on chemical reactions between a ferrous. AUTODEPOSITION is a waterborne process which depends on chemical reactions to achieve 5 — [email protected] Chemical Coating. Stage No. 6 — Plant.

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No tool markers, die, bluing or coil markings. But in case of electrocoating, the surface atom of the lattice may form bond with foreign atoms. These criteria have been established to ensure the maximum performance on each part. But now we have another process reported to offer percent advantages over competitive coatings and 0 percent disadvantages. High corrosion resistance Generally hrs. Coating may be bent back on itself with no cracking or peeling. This process coatjng been in commercial use since All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.

Presently, there are numerous installations in operation, both captive and job-shop, coating a variety of fabricated steel parts for the automotive and general industry markets.

Autophoretic Coating Process

It’s one more tool in the arsenal, and will autophoretix the needs some of the time; but you have to look at the actual parts and the actual service conditions. Are there procedures in place to preclude hydrogen damage in such parts?

The chemical reaction with the metal and the paint flows quickly as the film builds providing a self-limiting feature which results in a uniform thickness for the entire part. I’m searching for any independent research about autodeposition coating.

If not, I’m not so sure that this work would have legitimate scholarly value: Not compatible with aluminum or galvanized material. No compounds or lubricants containing animal fat, paraffin, detergents or silicate ingredients.

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Autophoretic® Coating Process

Of course, that doesn’t mean that ALL parts will chip and rust! This diffusion control leads to a uniform coating thickness on complex shapes and in recessed areas.

One through electric circuit another without. Initially, the deposition process is quite rapid, but slows down as the film increases in thickness. Since its inception, this unique process has been employed to coat billions of square feet of surface. Withstands nicking and marring for better handling. I know that these two processes are not the same.

In both cases metallic bond is getting formed, atuophoretic the bonding nature may not be same. Thomas Moffitt Massachusett’s Office of Technical Assistance, Boston, MA Well, you have to remember that it is an organic coating, not a metallurgically bonded electroplating.

On leaving the bath, the coating consists of two layers; one is a very cohesive reacted layer; while the other is composed of undeposited excess polymer and activator from the bath. This is a revolutionary way to meet higher performance and corrosion resistance standards at a competitive price.

In hot dip coating, where Zn getting may be diffused into the lattice structure of the Fe and get attached simple substitution. The mildly procwss bath liberates a small amount of iron from the steel parts being immersed, causing an immediate surface reaction that releases iron ions. Depends costing solvent, time, and temperature.

It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. Unlike coating processes that require a charge to deposit the coating i. Is not UV stable. I just read what I xoating above and I am not sure why I said what I did. Please contact your local PPG office for that paper. These ions interact with the latex in solution causing coating deposition on the surface of the steel parts.

So I am very glad to join this discussion. Thanks for the help. Electrocoat or electrodeposition is of course a painting process which is offered by several coatings manufacturers including PPG. The bath viscosity is close to that of water with little or no organic solvents in the coating bath. The coating thickness of the autodeposited film is time and temperature related. The newly deposited organic film is adherent yet quite porous.

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Description of Autophoretic®

A by-product of the heat-treating process No adhesive bonding materials such as tape, epoxy, etc. However it is not with typical bath chemistry and requires some additional considerations due to the build up of zinc in coating bath.

The continuous formation of coating provides a film with a high degree of surface protection and corrosion resistance. Typically, film thickness is controlled from 0. Uniformly coats the inside and outside of tubular shapes, complex assemblies, and narrow crevices. I have developed, researched, and produced autodeposition coatings, and lead this coatings to be applied in some automobile factories for many years.

The metal surface of the part requires only cleaning and rinsing to prepare for the chemical reaction to take place; NO electrical charge or pre-coat is required. Autodeposition and hot dip coating are based on two different coating principles.

The elimination of these stages leads to considerable savings in required floor space, energy, and operating costs, as well as the total elimination of toxic metals from the process. Sorry for the confusion, I have taken my forty lashes and autophoreric continue to hear about this from all those that know me. This forum is for technical discussions, not promotion of one technology over another, so proocess tell us what are the indications when electrocoating would be a better choice.

This unusual feature strongly limits carryover of coating chemicals into the rinse tanks and greatly reduces the demand for waste treatment. Considerably lower temperatures are required to cure the autodeposited parts.