Simulating study of atmospheric corrosion of Ni-advanced weathering steels in salinity environment: Formation and structure of magnetite rust particles prepared from FeCl2 solutions containing Ni2+ at neutral pH
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Abstract
In order to elucidate the role of alloying Ni in Ni-advanced weathering steels on the formation of Fe3O4 (magnetite) rust particles by atmospheric corrosion in salinity environment, aqueous FeCl2 solutions containing various amounts of NiCl2 were aged under bubbling the air at 50 °C for 24 h. The atomic ratio Ni/Fe of the solution was 0 – 0.2 and the solution pH before aging was about 7 over the whole Ni/Fe ratios. Aging for 3 h generated the Green rust(Cl-) ([Fe3IIFeIII(OH)8]+[Cl·nH2O]-) as a precursor of Fe3O4. Added Ni2+ was incorporated into Green rust(Cl-) to form Ni2+-substituted Green rust(Cl-) ([Fe3-xIINixIIFeIII(OH)8]+[Cl·nH2O]-]), resulting in enhancement of crystallization of this material. After aging for 24 h, the Ni2+-substituted Green rust(Cl-) formed at Ni/Fe = 0 – 0.08 was mainly transformed into spherical Fe3O4 particles. The crystallization and particle growth of Fe3O4 were promoted on elevating Ni/Fe ratio. At Ni/Fe ≥ 0.12, Fe3O4 formation was suddenly impeded to generate rod-shaped α-FeOOH particles, of which the material possesses more stable crystal structure than Fe3O4. These results suggest that alloying Ni in Ni-advanced weathering steels accelerates the formation of stable rust layer composed of Fe3O4 and/or α-FeOOH particles by atmospheric corrosion in salinity environment such as coastal and marine zones to contribute to the formation of the protective rust particle layer.
期刊介绍:
The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide.
The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them.
Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)