期刊
SURFACE & COATINGS TECHNOLOGY
卷 345, 期 -, 页码 40-52出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2018.03.075
关键词
Ni-P coatings; Additives; Electrodeposition; Corrosion efficiency
资金
- Excellence Initiative of Aix-Marseille University - A*MIDEX, a French Investissements d'Avenir programme [ANR-11-IDEX-0001-02]
Ni-P amorphous coatings are considered as important engineering alloys. In this paper, the effects of various additives on the properties of Ni-P thin films were investigated, including saccharine, glycine, pyridinium propyl sulfonate, coumarin, sodium citrate, and cerium sulfate. Potentiodynamic polarization and electrochemical impedance spectroscopy tests, scanning electron microscopy, X-ray fluorescence and diffraction, and atomic force microscopy were employed to study the properties of the samples. It was found that a proper concentration of these additives, except saccharine, noticeably improved the corrosion resistance, especially at high potentials (about 25% increase in instantaneous corrosion efficiency and about 300% in corrosion efficiency at high potentials) and decreased the surface roughness (by about 10 to 55%) of Ni-P thin films. Thinner, more uniform, and less porous coatings were formed in the presence of additives. Except saccharine, all the additives enhanced the P content of Ni-P films, which thus kept their amorphous structure; saccharine highly suppressed the incorporation of P inside the Ni lattice and a mixed amorphous-crystalline structure was stabilized.
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