Williams Form Engineering Corp. - Concrete Anchor Corrosion Protection

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Concrete Anchor Corrosion Protection

Stainless Steel	Epoxy Coating
Electro Zinc Plating	Hot Dip Galvanizing
End Caps

Stainless Steel

Stainless steel can be specified for use with most of Williams anchors (except for Spin-Lock mechanical anchors). Williams can supply anchor rods and components in grades of 304 and 316 for use in highly corrosive environments. Stainless steel is the best means of corrosion protection available from Williams Form Engineering, however, steel strengths are often reduced and anchor prices are increased. When specifying stainless steel make sure to specify the steel grade and make note of the change in strengths from different stainless steel grades. Some stainless steel types require longer lead times.

Electro Zinc Plating

Zinc plating is a process which deposits a thin layer of zinc over the steel. It is different from galvanizing because zinc plating is an electro-chemical process and not a dip in molten zinc. The advantages of zinc plating over galvanizing are control over zinc thickness and smoother surfaces. The zinc protects the steel as a sacrificial coating. If the coating is damaged, the sacrificial action continues as long as any zinc remains in the immediate area. Electro zinc plating should be done in accordance with ASTM B633 Type II. Commercial zinc plating is commonly 0.0001 inches to 0.0005 inches in thickness and does not require oversized tapped components.

Epoxy Coating

Fusion bonded epoxy coating of steel bars to help prevent corrosion has been successfully employed in many applications because of the chemical stability of epoxy resins. Epoxy coated bars and fasteners should be done in accordance with ASTM A775. Coating thickness is generally specified between 7 to 12 mils. Epoxy coated anchors and components are subject to damage if dragged on the ground or mishandled. Heavy plates and nuts are often galvanized even though the bar may be epoxy coated since large heavy components are difficult to protect against abrasion in the field. Epoxy coating patch kits are often used in the field for repairing nicked or scratched epoxy surfaces. Epoxy Coating is used strictly on Williams Cast-in-Place, Wil-Bond Epoxy or cement grouted anchors. Not recommended for fine thread forms.

Hot Dip Galvanizing

Zinc metal used in the galvanizing process provides a barrier between the steel substrate and the corrosive elements in its surroundings. The zinc coating sacrifices itself slowly by galvanic action to protect the base steel. Galvanized bars have excellent bond characteristics to grout or concrete and do not require as much care in handling as epoxy coated bars. However, galvanization of anchors rods is generally more expensive than epoxy coating and often has greater lead time. Hot dip galvanized bars and fasteners should be done in accordance with ASTM A153. Hot dip galvanized coating thickness for steel bars and the components is between 3 and 4 mils. 150 KSI high strength steel bars should always be mechanically cleaned (never acid washed) to avoid problems associated with hydrogen embrittlement. Hot Dip Galvanizing can be used on Williams Spin-Locks, cast-in-place anchors, epoxy and cement grout anchors. Oversized tapped hex nuts should be used with hot dip galvanized bars.

End Caps

Williams offers several different types of PVC, metal, and nylon reinforced end caps to provide corrosion protection at otherwise exposed anchor ends. Most often the caps are packed with corrosion inhibiting grease. Caps made from reinforced nylon and steel are used in exposed impact areas.


Fiber Reinforced Nylon Cap	Slip-On PVC Cap w/ Plastic Nut	Screw-On PVC Cap	Steel Tube w/ Jam Nut	Steel Tube Welded on Flange with Threaded Screw Connections

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