| 1 MINUTE READ

Coating Steel Fasteners

I am a manufacturing engineer responsible for product development for a supplier of fasteners and fastener tools. The big issue right now is finding a coating that can hold up to 1,000 hr of salt spray. We’ve had the greatest amount of success with zinc nickel plating (400 hr in salt spray). At this point, we are interested in any coating technology, including plating technologies, organic technologies, or even a plating/organic hybrid technology.

Share

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Q. I am a manufacturing engineer responsible for product development for a supplier of fasteners and fastener tools. We are currently exploring different coatings for screws and nails used in pressure-treated lumber-based building projects such as decks and other outdoor structures. We’re interested in different coating technologies with regard to corrosion resistance, and are getting ready to make a pretty big investment in a coating technology. We’re using this time to explore the various technologies on the market.

Our fasteners are made of steel, and they’re being used on and in treated lumber. There is sometimes interaction with other metal connectors. The big issue right now is finding a coating that can hold up to 1,000 hr of salt spray. ACQ (alkaline copper quaternary), used to preserve the lumber, plays a big role, too, because it accelerates corrosion. And cosmetics/aesthetics are important as well.

We’ve had the greatest amount of success with zinc nickel plating (400 hr in salt spray). At this point, we are interested in any coating technology, including plating technologies, organic technologies, or even a plating/organic hybrid technology. M. L.

 

A. I am not comfortable speaking about plating technologies. I can say, though, that I remember hearing a paper describing bulk finishing of small parts at a recent Electrocoat Conference. Electrocoated zinc alloy plated parts were able to withstand 1,000–1,500 hr of salt spray exposure. There is often a synergistic effect between electroplated surfaces and organic coatings that enhances corrosion resistance. It is the policy of Painting Clinic to withhold company names. However, suppliers of electrocoat paints are listed in the 2008 Products Finishing Directory and Technology Guide.
 

Related Topics

RELATED CONTENT

  • Masking for Surface Finishing

    Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.

  • Is Your Electroplating Waste Hazardous?

    Some that bears precious metals is, and there are a host of regulations to consider when recycling.

  • What is Electrocoating?

    E-coat can produce uniform finishes with excellent coverage and outstanding corrosion resistance.