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Different Types of Corrosion
- Recognition, Mechanisms & Prevention

Hydrogen-Induced Cracking
 

Recognition
   

What is hydrogen-induced cracking? Hydrogen-Induced Cracking (HIC) is brittle mechanical fracture caused by penetration and diffusion of atomic hydrogen into the crystal structure of an alloy. The phenomenon is also referred to as hydrogen embrittlement.

HIC is especially prevalent in iron alloys because of the restricted slip capabilities in the predominantly body-centered cubic (BCC) structure. HIC is generally limited to steels having a hardness of 22 or greater on the Rockwell C scale.
  Mechanisms
   

What causes hydrogen-induced cracking? Hydrogen-induced cracking results from atomic hydrogen being absorbed by solid metals. This can occur during elevated-temperature thermal treatments and in service during electroplating, contact with maintenance chemicals, corrosion reactions, cathodic protection, and operating in high-pressure hydrogen.

  Prevention
    How to prevent hydrogen-induced cracking? Hydrogen-induced cracking can be prevented through:
  • Control of stress level (residual or load) and hardness.
  • Avoid the hydrogen source.
  • Baking to remove hydrogen.
  For more details
    More details on environmental cracking are included in the following corrosion courses which you can take as in-house training courses, online courses or distance learning courses:

Corrosion and Its Prevention (5-day module)
 Corrosion and Its Prevention (2-day module)
 Corrosion, Metallurgy, Failure Analysis and Prevention (3 days)
 Marine Corrosion, Causes and Prevention (2 days)
 Materials Selection and Corrosion (2 days)
 Stainless Steels and Alloys: Why They Resist Corrosion and How They Fail (2 days)
     
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