Intergranular corrosion (IGC) and intergranular stress corrosion cracking (IGSCC) resistance improvement method for metallic alloys

• Main Authors: BARSUN H. FRED, CLARK STEVEN D, DESHPANDE NISHKAMRAJ U
• Format: Patent
• Language: English
• Published: 14.07.2015
• Subjects: ALLOYS; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method, structure, and/or material composition associated with overetching a structure or allow of interest to deplete magnesium content at and in a vicinity of grain boundaries which mitigates or prevents corrosion including, for example, intergranular corrosion (IGC) and/or intergranular stress corrosion cracking (IGSCC). Another aspect of the invention can include a process and material composition associated with providing a particular coating having a number of material properties. Additional steps, material composition(s), and/or exemplary structure(s) can also be provided which provides a nano coating over the depletion zone having a first coating in accordance with another embodiment of the invention.