Galvanizing
Portland Bolt installed its own environmentally friendly, hot-dip galvanizing line to ensure a quality corrosion resistant coating and respond to short lead times. Our hot-dip galvanized products meet the requirements of ASTM specifications A153, F2329, and A123 as well as AASHTO M232. We use absolutely no lead in our system and the only water that is lost in the process is through evaporation. The tank is 8' long X 3' wide X 6' deep. Our high speed spinner functions like a centrifuge to remove the excess zinc from the threads. We inspect each bolt as it comes out of the tank to insure all fasteners will take nuts and you will not experience installation nightmares in the field.
Prior to their final coating of molten zinc, a galvanized bolt undergoes an extensive preparation process. Headed bolts are wheelabrated to remove any excess hot forging scale, while non-headed bolts may skip this process. The bolts are then submerged in a caustic soda solution which removes cutting oil and dirt from the bolts. After rinsing, the bolts are submerged in sulfuric acid to remove the hot rolled scale and etch the surface of the steel which allows the zinc to more easily penetrate the surface layer of the fastener. After another rinsing, the final preparation phase requires the bolts to be submerged in a flux solution which facilitates the reaction of the zinc to the steel.
In addition to galvanizing product we manufacture, our galvanizing services are available for products other than fasteners. Should you wish to provide us with fabricated assemblies, castings, or other similar products, we may be able to galvanize them for you. Our standard lead time is only 3 working days, with the ability to expedite your delivery when required. Call us for a quote.
hot forging scale prior to galvanizing.
from the galvanizing tank.
to ensure a quality finish.
| Quantity | Equipment | Function |
|---|---|---|
| 1 | Wheelabrator | Used to remove hot forging scale from the heads of bolts. |
| 1 | Preparation Line | Consists of a caustic soda tank, two acid tanks, a flux tank, and four rinsing tanks. |
| 1 | Galvanizing Tank | 8' x 3' x 6' tank filled with 840° molten zinc. |
| 2 | Water Quench Tanks | Allows rapid cooling of parts so they can be inspected and packaged immediately. |