How is an IGC test done?
The procedure includes subjecting a specimen to a 24 to 120 hour boil in ferric sulfate – 50% sulfuric acid. This procedure measures the susceptibility of stainless steel and nickel alloys to inter granular attack associated with the precipitation of chromium carbides at grain boundaries.
What is IGC testing?
Intergranular Corrosion (IGC) or Intergranular Attack (IGA), is an efficient test for screening a material’s corrosion resistance under certain conditions. Element’s intergranular corrosion testing helps reveal errors of batches that are incorrectly processed, and highlight any areas where updates are needed.
What is ASTM A262?
ASTM A262 is a common intergranular corrosion testing method that can quickly screen batches of material to determine corrosion susceptibility. The ASTM A262 testing specification contains five unique intergranular corrosion tests.
What would be rapid screening method for identifying susceptibility to intergranular attack for austenitic stainless steel?
1.2 The Oxalic Acid Etch Test is a rapid method of identifying, by simple etching, those specimens of certain stainless steel grades that are essentially free of susceptibility to intergranular attack associated with chromium carbide precipitates.
Is IGC applicable for carbon steel?
How to reduce the risk of intergranular corrosion (IGC) Materials with less than 0.05% carbon normally have sufficient resistance against intergranular corrosion after welding. ELC (extra low carbon content) steels, i.e. steels with maximum 0.030% carbon, have very good resistance to intergranular corrosion.
What is an IgA blood test?
An IgA test measures the blood level of immunoglobulin A, one of the most common types of antibodies in the body. Antibodies (also called immunoglobulins) are proteins the immune system makes to recognize and get rid of germs.
What is sensitized stainless steel?
Sensitization refers to the precipitation of carbides at grain boundaries in a stainless steel or alloy, causing the alloy to be susceptible to intergranular corrosion. This results in susceptibility to intergranular corrosion.
What is sensitization in stainless steel?
Sensitization refers to the precipitation of carbides at grain boundaries in a stainless steel or alloy, causing the alloy to be susceptible to intergranular corrosion. Certain alloys, when exposed to a temperature characterized as a sensitizing temperature, become particularly susceptible to intergranular corrosion.
What type of inspection is usually required to detect intergranular corrosion?
Ultrasonic inspection can detect corrosion damage on some surfaces. It is commonly used to detect exfoliation and stress-corrosion cracks.
What are the causes of intergranular corrosion?
Intergranular corrosion (IGC) It is as a result of chromium depletion, mainly due to the precipitation of chromium carbides in the grain boundaries. Chromium carbides can be precipitated if the stainless steel is sensitized in the temperature range 550–850°C (1020–1560°F), for example during heat treatment or welding.