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| Influence of Complexing Agent on Corrosion Resistance of Ni-P Electroless Deposits in Sulfur-bearing Solution |
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| 西安理工大学材料学院 |
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Abstract Contraposing to the fact that the imported crude oil contains a large content of sulfur and causes serious corrosion, the corrosion resistance of Ni-P electroless deposits using lactic acid and citric acid as complexing agent respectively in sulfur-bearing solution was studied by electrochemical method, gravimetric method, microscopic analysis and X-ray diffraction. The results showed that the two kinds of Ni-P electroless deposits are both amorphous. The phosphorus content in the deposit using lactic acid as complexing agent is 10.04%, and in the deposit using citric acid as complexing agent is 11.93%. As the Na2S content increases, the polarizability increases, and the corrosion current and corrosion potential decrease while the Na2S content is between 1.0%-2.5%. The corrosin resistance of Ni-P electroless deposit using lactic acid as complexing agent is better than that of another kind. The corrosion rates of two kinds of deposits reach the maximum value when the Na2S content is 1.5% and the maximum corrosion rate is 25 mg/(m2·h).
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Received: 26 October 2006
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