期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 735, 期 -, 页码 1-12出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.11.054
关键词
Laser thermal spraying (LTS); Al-Ni coating; Differential scanning calorimetry (DSC); Residual stress; Corrosion mechanism
资金
- Key Research and Development Project of Jiangsu Province [BE2016052]
Amorphous Al-Ni coating with the Al and Ni mass ratios of 3: 2, 3: 1 and 4: 1 was sprayed on S355 steel of offshore platforms using a laser thermal spraying (LTS). The surface-interface morphologies, chemical element distribution, phase compositions and crystallization temperature of the obtained amorphous Al coatings were analyzed using a scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), and differential scanning calorimetry (DSC), respectively. The immersion corrosion behaviors of the Al-Ni coatings in 3.5% NaCl solution for 720 h were investigated. The results shows that the Al-Ni coating is composed of Al-Fe alloy, AlCrFe2, Ni2MnAl and amorphous Ni-MnAl alloy, the metallurgical bonding is formed at the Al-Ni coating interface due to the diffusions of Al, Ni and Fe elements, and the tensile residual stress induced by LTS accelerated the crack expansion. The amorphous Al-Ni coatings have a certain amount of amorphous component at the crystallization temperature of similar to 510 degrees C. The laser thermal sprayed Al-Ni coating generates the dense oxide film immersed in NaCl solution, hindering the anion from entering, which improving the corrosion resistance of Al-Ni coatings. The electrochemical corrosion resistance of Al-Ni coatings with the Al and Ni mass ratios of 3: 2 and 4: 1 is better than that with the Al and Ni mass ratio of 3: 1, effectively improving the corrosion resistance of S355 steel. (C) 2017 Elsevier B.V. All rights reserved.
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