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Rhenium cementation on zinc in aqueous acidic solutions

Abstract Rhenium has been cemented on Zn sheet in aqueous sulphuric acid solutions. The cementation took place concurrently with hydrogen evolution from the Zn substrate. The Re source was NH4ReO4. At the highest tested temperature (40°C), hydrogen evolution was intense, and the Re deposit was powdery and detached easily from the Zn surface. The higher the sulphuric acid concentration, the higher the rate of hydrogen evolution, which ranged between 15 and 200 cm3 h−1; this phenomenon enhanced the powdery character of the deposit. Continuous deposits, with high Re content (up to ∼96·5%) and a metallic shine, were obtained at low acid concentration (0·025–0·050M) and low temperatures (25°C). Perrhenate concentration variations did not affect the deposit quality in the studied conditions.