Technical Note: Stress Corrosion Cracking of Iron-Boron-Silicon Metallic Glasses in HCl Solution

Susceptibility of various iron-boron-silicon metallic glasses to stress corrosion cracking (SCC) was studied. Testing was carried out on thin metallic ribbons of Fe₇₈B ₁₃Si₉Fe₈₁B₁₃.₅Si₃.₅C₂, Fe₆₆Co₁₈B₁₅Si₁, Fe₇₇Cr₂B₁₆Si₅, and Fe₄₀Ni₃₈Mo₄B₁₈ in 0%, 25%, 50%, 75%, and 100% hydrochloric acid (HCl) solutions at room temperature. Tests were performed under constant strain conditions until complete separation of the ribbons occurred. Typical fractographic techniques indicated susceptibility to SCC of all the glasses, except Fe₄₀Ni₃₈Mo₄B₁₈ varied only as a function of the amplitude of the strain. Susceptibility was independent of the solution concentration and the addition of carbon, chromium, and cobalt to the glass. Results indicated Fe₄₀Ni₃₈Mo₄B₁₈ was not suspceptible to SCC in HCL solutions at different strain amplitudes.