alloy 400

Nickel Alloys for Corrosion Resistance

January 07, 2015 in Pipe by

Alloy pipeIf you need pipes that can withstand acidic corrosion, nickel alloys may be a good choice.

Nickel alloys like alloy 625, alloy 825 and alloy 400 fall between stainless steel and the exotic materials, such as tantalum, in terms of resistance to corrosion. They’re often used in environments where aggressive inorganic acids are present, where stainless steels would be susceptible to stress-corrosion pitting, cracking and crevice attack.

Corrosion-resistant Attributes

Nickel alloys have a variety of corrosion-resistant attributes, including:

  • Most are very resistant to chloride-induced stress corrosion cracking
  • Many can resist aggressive reducing acids, including hydrochloric and low-to-medium concentrations of sulfuric acid
  • A number of nickel alloys can endure both strong reducing acids and strong oxidizing acids
  • Many have high resistance to alkalis
  • Some have high resistance to localized attack (pitting and crevice corrosion)

Types of Nickel Alloys

There are six main types of nickel alloy, each with its own recommended use case: 

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