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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The bath viscosity is close to that of water with little or no organic solvents in the coating bath.
This is a revolutionary way to meet higher performance and corrosion resistance standards at a competitive price. On leaving the bath, the coating consists of two layers; autophoretid is a very cohesive reacted layer; while the other is composed of undeposited excess polymer and activator from the bath.
Unlike coating processes that require a charge to deposit the coating i. Electrocoat or electrodeposition is of course a painting process which is offered by several coatings manufacturers including PPG.
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.
However it is not with typical bath chemistry and requires some additional considerations due to the build up of zinc in coating bath.
The chemical reaction continues in the second layer, which results in film deposition and increased film thickness instead of solids loss to dragout. Since its inception, this unique process has been employed to coat billions of square feet of surface. The mildly acid bath liberates a small amount of iron from the steel parts being immersed, causing an immediate surface reaction that releases iron ions. Free from carbon enbrittlement. I have developed, researched, and produced autodeposition coatings, and lead this coatings to be applied in some automobile factories for many years.
Coats procesd on all surfaces; where it flows it coats with no runs or sags.
Autophoretic® Coating Process
Second line has just been commissioned for heavy vehicle brake plates. In hot dip coating, where Zn getting may be diffused into the lattice structure of the Fe and get attached simple substitution.
It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. From beautiful Pine Beach New Jersey: Not compatible with aluminum or galvanized material. This diffusion control leads to a uniform coating thickness on complex shapes and in recessed areas.
Express Coat Corporation
Metal surface must be low to medium carbon, cold or hot rolled steel. The newly deposited organic film is adherent yet quite porous.
Since this process involves a mild acid acting on the base proceds, can it result in delayed cracking under stress from hydrogen damage on a quench and tempered part as with other processes i. We have two lines running with ACC. Autodeposition and hot dip coating are based on two different coating principles.
The coating thickness of the autodeposited film is time and temperature related.
Is not UV stable. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. Thomas Moffitt Massachusett’s Office of Technical Assistance, Boston, MA Well, you have to remember that it coatting an organic coating, not a metallurgically bonded electroplating.
This allows the coating dispersion to flow into and around the most complex shapes. I know that these two processes are not the same. Please contact your local PPG office for that paper. In both cases autophoreic bond is getting formed, but the bonding nature may not be same.
If you try our search engine, I’m sure you can find some more. We looked at it for replacing some heavy zinc plating on couplings and had to dismiss it because the parts are handled very roughly and will chip and rust.
These ions interact with the latex in solution causing coating deposition on the surface of the steel parts. Typically, film thickness is controlled from 0. Uniformly coats the inside and outside of tubular shapes, complex assemblies, and narrow crevices.
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. Of course, that doesn’t mean that ALL parts will chip and rust!
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. This unusual feature strongly limits carryover of coating chemicals into the rinse tanks and greatly reduces the demand for waste treatment.