Seven acid’s etchant

Seven acid’s etchant - Alloy 945

Material Name: Alloy 945
Recipe No.: 12075
Primary Chemical Element in Material: Ni
Sample Type: Bulk
Uses: Microstructure
Etchant Name: Seven acid’s etchant
Type (Macro/Micro): Micro
Etching Method: Chemical etching
Etchant (Electrolyte) Composition: 300 ml hydrochloric acid, 60 ml nitric acid, 30 ml 40% hydrofluoric acids, 30 ml sulfuric acid, 30 gm anhydrous ferric chloride, 60 ml acetic acid, 300 ml water
Procedure (Condition): Swab etching using Seven acid’s etchant containing 300 ml hydrochloric acid, 60 ml nitric acid, 30 ml 40% hydrofluoric acids, 30 ml sulfuric acid, 30 gm anhydrous ferric chloride, 60 ml acetic acid and 300 ml water was found to be suitable to reveal the microstructure. Polished specimens were subjected to electrolytic extraction in CH3OH/HCl at 0.5A for 4-20 hours using standard ASTM practice E963-83. The extracted residue was subjected to SEM/EDX and XRD analyses.
Note: No data
Reference: Sarwan Mannan, TIME-TEMPERATURE-TRANSFORMATION DIAGRAM OF ALLOY 945, In book: Superalloy 718 and Derivatives, 2010, pp. 629-643.