The evolution of high-performance thin-film dry-lubricant coatings goes back to the early 1970s, when the Whitford Corporation introduced the first of its kind dry-film lubricant coating to replace phosphate & oil and greases. For the purposes of this document, the focus is solely on thin-film coatings used in oil and gas applications applied at less than 37 µm (1.5 mils) dry-film thickness (DFT).

As with most products in most industries, high-performance, thin-film, dry-lubricant coatings came about due to a pressing need to solve specific problems. In this case, the Oil & Gas industry (O&G) was facing serious problems with fasteners: torque consistency, corrosion, and galling in offshore and coastal installations . The fastener application added the complexity of tight tolerances of the mating faces that must be respected. The chief problem was achieving uniform torque values around a flange. The method commonly used was either phosphate and oil or bonded molybdenum and graphite, but neither was capable of achieving uniform friction from fastener to fastener.

One of the first introduced was a coating based on a Polyamide Imide binder resin (PAI). PAI offers ease of application, a wide operating temperature range from -250 to 260°C (-420 to 500°F) and good chemical and abrasion resistance. With a variety of lubricant packages available to coating formulators, the PAI 1000 series grew to meet additional needs in new applications. Typical lubricant formulations by the PAI 1000 series include PTFE, FEP and PTFE/MoS2 . This versatile series solved problems for a variety of applications such as fasteners, blow-out preventers, valves and tubing hangers, to list a few. All these applications require a low coefficient of friction, dry lubrication, torque consistency, anti-galling and improved corrosion performance in tight tolerance applications, which, when met, afforded users operational consistency, improved safety and a lower total cost of operation and ownership.

This content is only available via PDF.
You can access this article if you purchase or spend a download.