Nickel-Aluminium Alloy (Halogen-free)

Nickel-Aluminium Alloy (Halogen-free)

Contains 48% to 52% of alumnium (Al; Ar 26.98) and 48% to 52% of nickel (Ni; Ar 58.71).

Fine, grey powder, practically insoluble in water, soluble in mineral acids with formation of salts.

Chlorides Maximum 10 ppm.

Dissolve 0.400 g in 40 mL of a mixture of 67 volumes of sulfuric acid and 33 volumes of dilute nitric acid. Evaporate the solution nearly to dryness, dissolve the residue in water and dilute to 20.0 mL with the same solvent. To one half-aliquot of the solution, add 1.0 mL of 0.1 M silver nitrate. Filter after 15 min and add 0.2 mL of sodium chloride solution (containing 10 μg of chlorides per millilitre) to the filtrate. After 5 min the solution is more opalescent than a mixture of the second half-aliquot of the solution with 1.0 mL of 0.1 M silver nitrate.