Why Shocks and Zinc-Plated Suspension Parts Rust — And How to Help Prevent It

Written By Donald Burnham

Why Shocks and Zinc-Plated Suspension Parts Rust — And How to Help Prevent It

If you’ve noticed rust forming on your shocks, control arms, track bars, or other suspension components, you’re not alone. Off-road suspension systems take a beating from mud, water, salt, gravel, and harsh weather conditions year-round.

Many aftermarket suspension manufacturers use zinc-plated finishes because they hold up extremely well against rock chips and trail abuse compared to traditional painted surfaces. While zinc plating offers excellent durability, it still requires maintenance — especially in wet climates or areas where road salt is common.

Why Rust Forms on Suspension Components

Off-road suspension parts are constantly exposed to:

  • Water crossings

  • Mud and dirt buildup

  • Road salt

  • Snow and ice

  • Coastal moisture

  • Gravel and debris impacts

Over time, moisture and contaminants can sit on the surface of zinc-plated components and begin causing oxidation or surface corrosion.

This is especially common on:

  • Shocks and coilovers

  • Control arms

  • Track bars

  • Sway bar links

  • Steering components

  • Suspension brackets and hardware

In many cases, light surface rust is cosmetic and does not affect the structural integrity of the component. However, regular maintenance can greatly slow corrosion and keep your suspension looking and performing its best.

How to Protect Zinc-Plated Suspension Parts

Wash the Undercarriage Frequently

One of the best things you can do is regularly rinse the undercarriage after:

  • Off-road trips

  • Winter driving

  • Mud exposure

  • Beach or coastal driving

Pay close attention to suspension parts where mud and debris collect.

Apply a Protective Coating

After cleaning and drying the suspension, applying a corrosion inhibitor can help create a protective barrier against moisture and salt.

Popular products include:

  • Fluid Film

  • Wool Wax

  • Silicone protectants

  • Surface Shield

These products help reduce direct exposure to moisture and contaminants while making future cleaning easier.

Routine Inspections Matter

Periodic inspections can help catch corrosion early before it spreads.

We recommend:

  • Inspecting suspension components during tire rotations or oil changes

  • Cleaning buildup after trail runs

  • Reapplying protectant throughout winter months

  • Addressing damaged coatings early

Final Thoughts

Surface corrosion on shocks and zinc-plated suspension parts is a common part of off-road ownership — especially in harsh environments. Fortunately, regular cleaning and preventative maintenance can go a long way toward protecting your investment and extending the life of your suspension system.

A little maintenance today can help keep your suspension performing and looking great for years to come.

Donald Burnham