Rust protection for the exhaust - does that really help?

The exhaust is a part of every vehicle, which is seen by many as a kind of wearing part because of its rust susceptibility. But there are countless hints, tips and advice from self-proclaimed experts on how to permanently protect the exhaust from rust. Whether this actually works, and what can not work on some miracle drugs, you can read here.

Reasons for rusting the exhaust

Almost every exhaust starts to rust at some point. The problem is not so much the external load, but inside the exhaust:

  • condensation is created in the exhaust
  • acids are produced in the exhaust
  • In pure short-haul operation, the problem of chemical pollution for the exhaust usually becomes even greater

An exhaust therefore rusts in most cases from the inside out. On the other hand, it is very easy to eliminate or repair purely external rust spots and flash rust with conventional means.

Zinc spray for protection

Many swear by applying zinc spray to the outside of the exhaust to prevent rust. But since the stress mainly comes from inside, the external protection is not very effective.

It is better to use quality parts in end pots and other parts whose material contains more stainless steel. This gives a higher corrosion resistance.

Miracle drug with sacrificial anode

For some time, "sacrificial anode systems" have been offered to prevent the exhaust from rusting. Technically, the system is not explainable and not functional. Sacrificial anodes are also used in hot water boilers. Here, a base metal rusts, and is "sacrificed" to protect a more noble metal. But that can not be used - not even with external power.

Tips & Tricks

A galvanized exhaust already contains a sacrificial anode - the zinc layer. More sacrificial anodes would bring nothing, and not protect against rust through from the inside.

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