High-S, especially resulfurized steels are discouraged from Boriding. What can a 0.1% Sulfur (and 0.5% Mn in ~0.1%C steel with Minor Cr, W, Ni alloys, all below 0.5%) do harm to boriding layer? Is it forming soft phases? Low-melting eutectic? brittle but mechanically weak phase? Or a combination thereof?
Can any separate chemical agents be treated on steel surface to make it fit for boronizing?
Safwan al-qawabah
- Corrosion resistance of Cr-Mo alloy in the presence of elemental sulfur is significantly lower than its resistance in the presence of sulfide ions with the same experimental conditions.
- Increasing the pH significantly decreases the corrosion rate of Cr-Mo alloy steel in the presence of elemental sulfur, which is due to the formation of evener and compact corrosion product layers on the alloy surface.
- The effect of immersion time on the corrosion behavior of the alloy is more complicated than the effect of pH. Results suggest that a number of factors such as microstructure, composition and the stability of corrosion product layers and immersion time can increase or decrease the corrosion rate.
- How stable the corrosion product layers are from elemental sulfur corrosion in various aggressive environments needs to be further investigated.
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