- Electrolytic Nickel plating:
Electrolytic Nickel plating has been widely used in magnetic industries for many applications.
Thickness of Nickel plating shall be 10 to 25 microns.
- Aluminum Ion Vapor Deposition (Alum IVD)
The Aluminum IVD process was developed by McDonnell Douglas for the Air Force. The intent was to show that this is an effective coating for replacing Cadmium for the aerospace and commercial market. This process is developed to solve number of different problems. Corrosion was the major problem. IVD also avoids hydrogen embitterment, galvanic corrosion, dissimilar metal problems and fatigue reduction.
The Standard procedures are degreasing the parts by aluminum oxide clean or grit blast (glass bead blast).
The IVD process begins once the parts are cleaned and put into the IVD chamber. It is then pumped down to a very low vacuum at which time the chamber is back filled with argon. This is called “glow discharge” cleaning. Then the chamber is pumped down again and ceramic heat resistant called “boats” are heated. Next, 99.9% pure aluminum wire is fed into them and vaporized.
This process is versatile and works well on a wide variety of parts, shapes and materials. We have found this to work very well on NdFeB magnets.
The current Mil Spec. for this process is: Mil-C-83488 Rev. C
When using this spec. you must also call out a “Class” and a “Type”. For magnets, Class 2 and Type 2 are the most often used combination.
Mil-C-83488 Rev. C
Class 1 .001 minimum thickness
Class 2 .0005 minimum thickness
Class 3 .0003 minimum thickness
Type 1: As coated
Type 2: With a chromate conversion coating
Class 1 is used for rack-coating parts or wherever good corrosion protection is needed.
Class 2 is used where there might be some close tolerance that needs to be held.
Class 3 is basically used for fasteners where the threads cannot stand a large build-up.
- Parylene Coating
Parylene is a generic name for a unique family of polymers used as conformal coatings in protective applications. The coating process exposes product to the gas-phase monomer at low pressure. Through vacuum deposition, Parylene condenses on the object’s surface in a polycrystalline fashion, providing a coating that is truly conformal and pinhole free.
Compared to liquid processes, the effects of gravity and surface tension are negligible so there is no bridging, thin-out, pinholes, puddling, run-off or sagging. And, the process takes place at room temperature so there is no thermal or mechanical stress on the product.
Parylene is physically stable and chemically inert within its usable temperature range. For example, in the presence of oxygen, Parylene type “C” is stable from cryogenic (liquid nitrogen) temperatures to 125°C. Parylene provides excellent protection from moisture, salt spray, corrosive vapors, solvents, airborne contaminants and other hostile environments.
Standard call out for thickness .0005/.001
More is considered as double coat .001/.0015
- Teflon Coating
The name “Teflon” is a Dupont trade name for industrial type coatings. “Teflon-S” coatings are self-priming, one coat products. They are formulated with organic binders to improve adhesion without the use of primers, so they cure at lower temperatures than pure fluorploymer dispersions. The parts to be coated are cleaned and blasted to provide a good adhesion, the Teflon is spray applied and cured in an oven at approximately 325 degree.
Standard thickness .005/.0015
Double coating .001/.0015
Specify Color: blue or orange
- Xylan Coating
Xylan coating is another industrial coating similar to Teflon but made by a competitor of Dupont. The properties are very similar as well. 1054 Xylan is gray in color and can also be 1010 Xylan in black. This coating is available from both of our Teflon coaters and the pricing structure is the same, however it is unlikely to ever use a double coat of this product.
#1054 Xylan: grey .0005 / .0015 thickness
#1010 Xylan: black .0005 / .0015 thickness
- Zinc Plating
Zinc plating is Electro-deposited similar to electrolytic nickel plating and is applied to iron or steel for corrosion protection. Zinc coated steel will not rust even when exposed by scratched because of the galvanic prot4ectin of the zinc. Zinc can have a bright or dull finish. Bright Zinc closely resembles bright chromium. However, bright zinc does not have the permanence of surface appearance. Zinc is normally deposited directly on the base metal material. Parts having a hardness greater than Rc-40 must be heat-treated prior to plating.
The current spec for this process is ASTM B633-85 & QQ-Z-325C
When using either of the above you must call out “Type” and “Class”
Type 1: as coated Class 1 : .0010 thickness
Type 2: with Chromate Class 2 : .0005 thickness
Type 3: with Phosphate Class 3: .00002 thickness