The effect of surface treatment on the corrosion behavior of a pure Ta sheet in an equimolar NaCl–KCl melt at 850°C in air. Part 1: Laser surface melting

Abstract

The corrosion behavior of pure Ta and laser surface melting-treated Ta sheets was investigated in an equimolar NaCl-KCl melt at 850°C in air. The results show that the predominant factors involved in the consumption of materials were reactions that form sodium-containing oxides and Ta 2 O 5 . High corrosion stress led to slip of the untreated Ta surface grains, further resulting in preferential corrosion along slip bands. The slip of surface grains substantially deteriorated the bonding between the corrosion scale and matrix, thus leading to rapid degradation of the corrosion scale. The melt layer consisted of a thin Ta 2 O 5 film, and the inner dendrite layer demonstrated self-healing characteristics during corrosion and presented a better hot corrosion resistance than the untreated Ta owing to the excellent bonding at the scale and melt layer interface. K E Y W O R D S chloride, hot corrosion, LSM, oxidation, Ta

Improved oxidation and hot corrosion resistance of Ta‐doped NiAlY alloy at 750°C

“…Among the candidate elements, Ta displays great potential as a substitute for Cr to improve the oxidation and hot corrosion resistance of NiAlY coatings. [8,9] George et al [10] proposed the beneficial effect of Ta for the hot corrosion resistance of Ni-based superalloys exposed to Na 2 SO 4 at 900°C and 1000°C. Robin and Rosa [11] found that the Ta improved the corrosion resistance of Nb-based alloys.…”

Aqueous Ferrous Chloride as a Low-Cost Corrosive to Deal with Spent Coin-Type Cells

“…Here, we use an immersion method as a one-pot reaction to deal with the lithium metal-containing coin cell waste. In our method, the sealing-breaking as a prerequisite process is accelerated by the chloride corrosion of the stainless-steel cell case. − At the same time, water involves the gradual and controllable conversion of Li and HF to LiOH and LiF. We proposed that 0.5 M FeCl 3 aqueous solution is the optimized choice for coin cell waste management by comparing the corrosion of bare coin cell cases and half-cells in the medium of FeCl 3 , cupric chloride (CuCl 2 ), and sodium chloride (NaCl).…”