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Citation: Li Daohua, Ye Xiangrong, Zhou Yiming, Xin Xinquan. Constitution and Structure of the Colored Passive Films of W-S Cluster Compounds on Steel Surface[J]. Chinese Journal of Applied Chemistry, ;1998, 15(6): 1-5. shu

Constitution and Structure of the Colored Passive Films of W-S Cluster Compounds on Steel Surface

Coordination Chemistry Institute of Nanjing University, State Key Laboratory of Coordination Chemistry, Nanjing 210093

Received Date: 16 March 1998
Revised Date: 22 June 1998

Colored W-S cluster compound films as decorative and anticonosive layers were coated on strrl surface by immevsing in W S₄^2- solution. The results of FT-IR, F-IR, FT-Ra-man, APS and AES analyses showed the existence of W-S-Fe, terminal W-S and terminal W-O bonds in the cluster films. The films were composed of the elements W, S, Fe and O. The valences of these elements are found to be +6, +6 (+4), +3, -2 in the surface, and +6 (+4), -2, +2, -2 in the internal layer of the films, respectively. A multimolecular layer structure of the films has been verified. The relative atomic percent contents and the thickness of the films were calculated at the constant elemental composition section on the AES profile curves. The longer the reaction time, the thicker the films. On heating at 250 ℃ in air for 2 hours the structure and distribution of the elements changed, while the composition and valence state of the elements in the films remained unchanged.
- W-S cluster compound,
- colored passive film,
- steel surface
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