Metal Compatibility of 1,1,1,4,4‐Hexafluoro‐2‐Butene, an Eco‐Friendly Halon Replacement Fire Suppressant Under Storage Conditions

Under storage environments (high voltage, high and low temperature alternating as simulation conditions), significant changes were observed in the full immersion corrosion experiments conducted on common metal materials in storage containers (304 stainless steel, Q235 carbon steel, H59 brass, T2 copper, and 6061 aluminum alloy). In the experiment, the corrosion rate ranking of HFO‐1336mzz (Z) was Q235 carbon steel > 6061 aluminum alloy > 304 stainless steel > H59 brass > T2 copper; HFO‐1336mzz (E) ranking: Q235 carbon steel > T2 copper > 6061 aluminum alloy > H59 brass > 304 stainless steel; visible corrosion products mainly exist in the form of dots, blocks, and thin films at the microscopic level; HFO‐1336mzz (Z)/(E) undergoes cracking first, followed by polymerization of various products. This phenomenon indicates that the thermal instability of trans HFO‐1336mzz is higher than that of cis, and the hydrofluoric acid (HF) produced by decomposition is the main cause of metal corrosion. This study provides a reference for the existence state and storage impact of HFO‐1336mzz under conventional storage conditions.