What is intergranular corrosion?
It is a selective corrosion that occurs locally along the boundaries of metal grains (grain boundaries). After corrosion, the surface of the material may be intact, but the bonding force between grains has been lost, resulting in a sharp decrease in material strength and even fragmentation into powder, causing catastrophic failure.
Typical requirements for "intergranular corrosion resistance environment"
When the working environment meets both of the following conditions, the intergranular corrosion resistance of the material must be considered:
| Medium conditions | There is a specific corrosive medium present.Oxidative or weakly oxidizing acids,organic acids,organic acids,high temperature water/steam (especially in environments containing chloride ions and oxygen). |
| Process conditions | The material will experience a "dangerous temperature range" during manufacturing or use.Welding,high temperature slow cooling,hot processing. |
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