期刊
SURFACE ENGINEERING
卷 27, 期 7, 页码 504-508出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/026708410X12786785573517
关键词
Air plasma spraying; Ni-Ti coating; Ni-Al coating; Corrosion; Polarisation test; Immersion test
Ni-3Al and Ni-3Ti alloys were deposited on AISI 1045 steel substrate using air plasma spraying process. In this regard, mechanically alloyed feedstock powders were used. Open circuit potential E-OCP measurements and Tafel polarisation tests were carried out to study corrosion behaviour of the coatings in 3.5% NaCl solution. These tests indicated that the corrosion performance of the Ni-3Ti coating is better than that of the Ni-3Al coating. The corrosion current densities were three times lower in the Ni-3Ti coating than in Ni-3Al coating. In addition, Ni-3Ti coating showed better passive behaviour than Ni-3Al coating. After 10 h of immersion, the surface of Ni-3Al coating became pitted, and rust spots appeared on the surface. In contrast, there was no rusting and pitting on the surface of Ni-3Ti coating even after 10 h of immersion.
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