The piston rod is both a structural member and the moving surface that passes through the rod seal. Its surface treatment affects corrosion resistance, wear and seal life. A finish that works indoors may be unsuitable for a splash zone or abrasive industrial process.
Translate the environment into measurable requirements
Start with saltwater exposure, abrasive debris, expected contact damage and the period for which the rod remains extended. Parker describes hard chrome, nickel chrome, ceramic and laser-clad options for different service conditions and evaluates coatings through corrosion and wear tests. Those test results apply to the tested coating and substrate, not to every supplier’s material with the same generic name. The rod finish and coating integrity must also suit the selected seal.
Comprobaciones técnicas
- Define the actual exposure cycle, including cleaning chemicals and stagnant periods.
- Ask for substrate, coating process, thickness and finished surface specification.
- Check resistance to impact or local damage as well as salt-spray performance.
- Confirm seal supplier approval for the final rod surface.
- Plan inspection and repair criteria for pits, scratches or coating loss.
Un error habitual que hay que evitar
Treating a salt-spray hour number as a service-life promise ignores rod motion, damage, seals and maintenance. Equally, a corrosion-resistant coating does not correct side loading or poor alignment.
Datos que hay que enviar junto con la solicitud
- Environment and expected exposed-rod time.
- Rod diameter, stroke, speed and seal material.
- Required coating evidence and acceptance tests.
- Repair or replacement expectations at the operating site.
Compare candidate coating systems with project-specific evidence and confirm the final finish on the approved cylinder drawing. For related selection guidance, see our marine cylinder corrosion guide.
Referencias técnicas: Parker rod-coating options; Parker PTFE sealing material FAQ. Portada: esquema conceptual original, no es una fotografía del producto.