DETECT HOW METAL BEHAVE IN CORROSIVE ATMOSPHERE
HOW DOES PITTING CORROSION TAKE PLACE IN METALS?
The successful use of stainless steels and nickel-base alloys in chloride-containing environments, including seawater, depends on their ability to resist localized attack. The term ‘localized attack’ generally includes pitting corrosion, crevice corrosion, stress corrosion cracking and intergranular corrosion.
Professional Testing Services offers pitting corrosion testing and analysis for stainless steels and metallic products used in many industries such as Oil and Gas, Aerospace, and Civil and Industrial Environments.
ASTM G48 – A
PTS performs pitting corrosion test conforming to ASTM G48 A, which involves the submersion of steels and related alloys in a 6% wt ferrite chloride solution, typically for 24hrs duration at designated temperatures.
This test is normally used to access stainless steel and related alloys for its pitting corrosion resistance at the welding procedure qualification stage.
Products designed for use in the marine industry or aggressive chlorinated areas are commonly evaluated using G48 – A, and materials such as UNS S31603, S44735, N08367, and N06022 are typically tested though they are non-exhaustive.
ASTM G48 - A, C & E
PTS also performs a critical pitting corrosion test conforming to ASTM G48 C, which involves immersion of nickel and chromium-bearing alloys in a 6% wt ferrite chloride for 72-hrs subjected to incremental temperatures until pitting is observed, thereby evaluating the critical pitting temperature.
Another test variation, ASTM G48 E, is also available specifically for stainless steel.
The most common pitting corrosion causes are:
- Cracks in the protective coating
- Scratches, scuffs & small chips
- Non-uniform stress
- Defective metal substrate
- Turbulent fluid flow
- Non-uniform protective coating
- Chemical attack on protective coating
Application of pitting corrosion test
Evaluate the likelihood of a metal developing localized corrosion in the form of holes on its surface
Common Test Method
ASTM G48 - A, C & E
ASTM G48 – C & E
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With a state-of-the-art corrosion testing laboratory, our expert testing team perform a wide range of well-recognized pitting and standard test methods on various metal types, including duplex and austenitic stainless steels and wrought nickel-rich chromium-bearing alloys.
For more information on our pitting corrosive test, call us or send us an enquiry today.