Zinc phosphating is a coating process that enhances the surface qualities of metal parts by:
Rust is the first thing that springs to mind — everybody knows how hard winter road salt is on a car’s body — but that’s not the only challenge metal industrial parts face. Any metal part that’s exposed to corrosive chemicals should have a protective coating.
Zinc phosphating is one of the most popular ways to provide that protection because it’s much safer for the environment than older coatings that relied on lead and other toxic substances.
Every metal conducts electricity — which is awesome for transmission cables and wires within electrical devices. The trouble is that many of these devices use metallic screws, cases and other components.
These metal components need to be non-conductive. Otherwise, they’ll reroute electrical current away from wherever it’s supposed to go and provide an annoying electric shock to anybody who touches the metal.
Think about what happens when you splash water on your bathroom mirror in the morning: It just slides right down the surface of the glass. Many metal surfaces are slippery in the same way, but they need a coat of paint that will stay in place for years of use. Other metal parts need to be lubricated, but the lubricant, being slick, slides right off.
Zinc phosphating adds a slightly rough layer to the exterior of a piece of metal that gives paint and lubricants something to grab onto.
Most bare metals aren’t much to look at (unless you’re really into gray), and their coloration is inconsistent over the entire surface of a part. Zinc phosphating provides a consistent color and tone that makes metal parts more aesthetically appealing.
Lots of today’s high-tech consumer products have metal surfaces held together with machine screws that help create a space-age look and feel. Zinc phosphating is one of the processes which enable that kind of visual appeal.
Paulo’s approach to zinc phosphating
At Paulo, our zinc-phosphating lines are computer-controlled to ensure consistent quality that takes into account the nature of the metal parts and how they will be used.
Our treatment process uses a drum three feet wide and two feet in diameter. It’s best for a large volume of small parts like screws, nuts and bolts that will tumble together while they’re being treated. It’s not ideal for big parts like car bumpers or crank shafts.
Our automated processes mean we can handle large lot sizes in quick time frames. And because we can process for multiple user needs, we can do things like add post coatings with oils and sealants to boost corrosion fighting or add lubricity.
And of course, all of our zinc-phosphating processes comply with industry and quality standards.