Stress corrosion cracking in brass

Brass is generally a very corrosion resistant material. Like many other materials and alloys, however, brass can under certain circumstances be susceptible to stress corrosion cracking. What is often due to this and how you can avoid stress corrosion cracking, you can read here.

Entzinching as a possible cause

Brass is made of copper and zinc. Under certain circumstances, this material will cause selective corrosion and thus dezincification. As a result, pitting can occur, under certain unfavorable conditions also stress corrosion cracking.

Brass with a high zinc content is generally endangered, but special alloys are protected against dezincification, even if the brass is constantly exposed to water. For some alloys, the action of ammonia, which has accumulated in the ambient air, is a possible contributor to stress corrosion cracking.

Basically, the following conditions must be met:

  • the brass alloy must be susceptible to stress corrosion cracking
  • There must be clear and permanent tensile stresses on the metal part
  • Occasionally, additional corrosion-inducing agents must also act on the brass part

Tips & Tricks

In principle, try to constructively avoid tensile stresses in brass or to provide stress relief.

Video Board: Mod-01 Lec-32 Stress corrosion cracking: mechanisms(dissolution controlled)