Abstract
In order to improve corrosion resistance of the 316L stainless steel in liquid zinc, four different kinds of TiAl–Nb coatings were deposited by high velocity oxygen fuel spraying. The results indicated that the TiAl–Nb coatings have dense and uniform microstructure and good mechanical properties. The TiAl–Nb coatings exhibit excellent corrosion resistance. Four different kinds of TiAl–Nb coatings have a incubation time, which do react with liquid zinc. The Ti28.15Al63.4Nb8.25Y0.2 coating possesses the longest lifetime, which can reach up to 1080 h. The TiAl–Nb coatings can provide a long-term corrosion protection for 316L stainless steel. The Al content has an important effect on the corrosion resistance of the coating, and the addition of the Y element may benefit the corrosion resistance to some extent. The corrosion process of the coating consists of the following steps: physical barrier of the TiAl–Nb coatings (incubation period), the corrosion of bond coat and the failure of the coatings.
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