1. Shougang Research Institute of Technology, Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron & Steel Production Technology, Beijing 100043, China
Abstract:The influence study of sulfidation corrosion time of tinplate on the composition in corrosion products could promote the understanding of sulfidation corrosion mechanism of tinplate and the resolution for the problem of sulfur blackening. The immersion time of tinplate in sodium sulfide-acetic acid simulated solution (pH 6) was varied in experiments. The mass fraction of main elements as well as the component and valence state of S in products obtained with different sulfidation corrosion times was analyzed by X-ray photoelectron spectrometer (XPS). The results indicated that when the sulfidation corrosion time was prolonged from 2d and 9d to 23d, the mass fraction of S gradually increased, while the mass fraction of O firstly decreased and then increased. In finally stable sulfidation corrosion products, the mass fraction of Sn was near 0, and the mass fraction of Fe was fluctuated around 60%. Sn metal could only provide physical protection role on matrix. The components of S in sulfidation corrosion products mainly included S, S- and S2-, and had no change. However, the relative content of components in each valence state changed, i.e., the mass fraction of low-valence S decreased and the mass fraction of high-valence S increased. In other words, the combination state of S showed the trend of being oxidized in sulfidation corrosion process. The increase of Sn layer thickness and uniformity as well as the addition of reducing substances in canned matter were effective routes to reduce the sulfidation corrosion.
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