Understanding the corrosion of molten ZnCl 2 on metal surfaces is significant for the corrosion protection of metals, sustainable use of molten salts, preparation of ZnO coatings, and so on. In this paper, surfaces of pure Ni, Cr, and Fe corroded by molten ZnCl 2 were investigated. The results show that Ni suffered very slight corrosion, while Cr experienced more serious corrosion than Ni, but lighter corrosion than Fe. The morphology of the corrosion of Cr and Fe, respectively, presented pitting and intergranular corrosion characteristics. Furthermore, nanostructured ZnO coatings were obtained on the surfaces of Ni and Fe, but not on the surface of Cr. The ZnO coating on the Ni surface was doped with a small amount of Zn 5 (OH) 8 Cl 2 , and the ZnO coating on the Fe surface was doped with ZnFe 2 O 4 and Zn 2 OCl 2 . The coatings on the Ni and Fe surfaces had an average thickness of 1.5 and 50 μm, respectively. K E Y W O R D S coating, corrosion, metal, molten ZnCl 2 , ZnO

The corrosion behavior of the UNS N10003 alloy in Fenton's reagent was investigated at room temperature for 600 hr by the static immersion method. The results showed that the alloy suffered obvious pitting corrosion. The lattice parameter of this alloy has a slight decrease after corrosion. This is mainly attributed to the depletion of Mo‐rich carbides dissolving into solution caused by the hydroxyl radical with strong oxidization, which is very different from the result of the UNS N10003 alloy under the molten salt condition. The results provide an insight into the corrosion of the alloy under hydroxyl radical conditions (i.e., Fenton's reagent), and will offer a realistic instruction in related fields.

The ion-enrichment inside carbon nanotubes (CNTs) offers the possibility of applications in water purification, ion batteries, memory devices, supercapacitors, field emission and functional hybrid nanostructures. However, the low filling capacity of CNTs in salt solutions due to end caps and blockages remains a barrier to the practical use of such applications. In this study, we fabricated ultra-short CNTs that were free from end caps and blockages using ball milling and acid pickling. We then compared their ion-enrichment capacity with that of long CNTs. The results showed that the ion-enrichment capacity of ultra-short CNTs was much higher than that of long CNTs. Furthermore, a broad range of ions could be enriched in the ultra-short CNTs including alkali-metal ions (e.g., K+), alkaline-earth-metal ions (e.g., Ca2+) and heavy-metal ions (e.g., Pb2+). The ultra-short CNTs were much more unobstructed than the raw long CNTs, which was due to the increased orifice number per unit mass of CNTs and the decreased difficulty in removing the blockages in the middle section inside the CNTs. Under the hydrated-cation–π interactions, the ultra-short CNTs with few end caps and blockages could highly efficiently enrich ions.

The investigation of natural particle suspensions (NPSs) in molten ZnCl2 can be performed by in situ ultraviolet-visible spectroscopy.