| Studying on a low toxicity, low cost and efficient corrosion inhibitor for alloy steel in marine corrosion will have practical significance. The paper studied the corrosion inhibitor for alloy steel in marine environment by combining gravimetric method and electrochemical method. The optimum formula were probed by designing orthogonal test. The function of the corrosion inhibitor type and process were analyzed according to experiments. Meanwhile, the processes of inhibition and the composition of corrosion protective film were studied with SEM, AFM and XPS. Finally, the paper explored preliminarily the application foreground of corrosion inhibitor by using the corrosion inhibitor to sell the amorphous coating.The main results are summarized as follows:The corrosion inhibitor which inhibition rate was more than 90% was obtained through the experiments. This corrosion inhibitor is a kind of anode type corrosion inhibitor. First of all, the experiment reveals that evolution process of the electrochemical corrosion inhibitor effect. In the film-forming process, at the beginning of L921A steel soaking in the corrosion inhibitor, it occurs short-lived surface corrosion and impedance decreases, but with the extension of immersion time, the effective component of inhibitor will gradually form a protective film on the surface of L921A steel, and impedance increases rapidly. By forming a protective film in the steel surface to achieve the purpose of corrosion. At the same time, it demonstrates the evolution of the electrochemical experiment and study the formation mechanism and the composition of corrosion inhibitor film. The protective film is composed of discontinuous precipitation omentum and iron oxide film composition, the alloy steel surface can be completely covered. Omentum precipitation mainly by CeO2, CaCO3, Ca2P2O7 components. Furthermore, the paper preliminarily proved that the inhibitor could be used in sealing treatment of amorphous coating. |
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