Abstract
The corrosion rate and effect of electrolytic polarization of various metallic materials dipped in condensed phosphoric acid (CPA) was observed in the range of temperature from 50°C to 300°C.
The result obtained is as follows:
1) Ta is the most anticorrosive material below 200°C.
2) Hastelloy B is fairly good below 150°C.
3) Stainless steel which contains Cr, Ni, Mo and Cu has resistivity in the concentrated CPA below 150°C but is soluble in the dilute CPA.
4) Anticorrosivity of stainless steel can be improved by the anodic polarization process.
5) Duriment, Ti and Zr have not resistivity in the CPA above 100°C.
