Applications

The dip/spin process is ideally suited for small parts that have contours so that the parts can be coated in bulk to prevent adhering to each other. Examples of such parts are: fasteners, spring clamps, screws, bolts, motor mounts, o-rings, nails, clips, muffler hangers, body mounts, etc.

Government regulations and product performance requirements are causing plating processes to be converted to coating processes. These regulations have practically eliminated the use of chrome, lead and other elements which are unfriendly to the environment.

In addition, component manufacturers must adhere to more stringent specifications which provide far higher salt spray performance and more consistent torque tension capabilities.

The answer is dip/spinning coatings onto parts that are pre-treated with a zinc-phosphate coating. Hi-Tech Coatings is authorized and licensed to apply a wide variety of coatings which will improve salt spray performance requirements and torque tension relationships. In addition, the dip/spin process significantly reduces the problem of hydrogen embrittlement.

The dip/spin process is very cost effective process since it is a bulk process. The transfer efficiency of the coatings areupwards of 90 percent which is far superior to spray coating

The Dip Spin Process

Parts are placed on a conveyor and then metered by weight into a 24" wire mesh basket. The basket (full of parts) is submerged into a coating vat. The basket is then raised out of the coating solution, yet still remains in the vat and spun up to up to 600 rpm.The excess coating that is spun off is cuaght by the paint vat and reused.

Depending upon the application, the coating viscosity, temperature, spin velocity and curing time can be varied to provide the desired mil thickness and consistent repeatability. Once the process is developed a specific process control data sheet can be assigned to the specific part to insure proven predictable performance.

The dip/spin process is a three step process for one coat and a five step process for two coats.
1. Cleaning and pre-treatment
2. Apply Coating (1st coat)
3. Cure Oven
4. Apply Coating (2nd coat, if necessary)
5. Cure oven


When it comes to pre-treatment Hi-Tech Coatings has 5 new state-of-the-art phosphate coating lines which are capable of microcrystalline, medium and macrocrystalline light zinc phosphate coatings. Hi-Tech can also provide black phosphate and manganese phosphate. In addition, Hi-Tech is able to provide shot blasting as a pre-treatment with aluminum oxide, steel grit, plastic and glass bead. We also have the ability to acid pickle and alkaline wash. In some cases parts are pretreated using our in-house tumblers and vibratory deburring equipment. The exhaust from curing ovens, spray booths and dip/spin lines are ducted to a catalytic oxidzer to completely burn off 98%-99% of the volatile organic compounds (voc's) and hazardous air pollutants (haps). Curing cycles range from a few minutes to a half an hour. Temperaturs range from 150 degree F to 400 degrees F.

Hi-Tech Coatings currently has 7 dip/spin lines capable of handling high volume parts. These lines compliment our chain-on-edge and spray coating lines.