Chemical Solutions

Rust Preventatives

The black magnetite or black oxide finish does not provide corrosion resistance on its own, so an oil, wax or sealer of some sort must be applied.  When choosing a rust preventative for black oxide, consider the following questions:

  • Is there a specific coating called out – solvent oil, water soluble oil, wax, torque modified sealer, etc.?
  • What are the ASTM B117 salt spray or humidity testing requirements? (Ex. 96 hour salt spray/400 hour humidity)
  • Is a dry-to-touch or oily surface required?
  • Are there any lubricity requirements?
  • Are there any Volatile Organic Compound (VOC) operating requirements?
  • Any concerns about low flash-point oils?


Selecting a rust preventative can be challenging with all of the options available. JSA technical sales and service representatives offer a valuable resource of knowledge and experience to help with this process.

  • On site visits to review the process equipment and production parts
  • Free sample part processing in the JSA lab
  • Free samples of the rust preventative chemicals for on site testing
  • Start-up assistance and continued service to ensure product performance and customer approval