| HAO Yu-lin,CAI Ning,YAO Shi-cong,LONG Yuan,LI Min.Effect of Selective Oxidation Behavior of High Strength Dual-phase Steel Surface on Phosphating Properties[J],49(8):309-315 |
| Effect of Selective Oxidation Behavior of High Strength Dual-phase Steel Surface on Phosphating Properties |
| Received:October 27, 2019 Revised:August 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.08.036 |
| KeyWord:dual-phase steel selective oxidation phosphating acid etching Mn2SiO4 MnAl2O4 |
| Author | Institution |
| HAO Yu-lin |
Technical Research Institute of Shougang Group Co. Ltd, Beijing , China |
| CAI Ning |
Technical Research Institute of Shougang Group Co. Ltd, Beijing , China |
| YAO Shi-cong |
Technical Research Institute of Shougang Group Co. Ltd, Beijing , China |
| LONG Yuan |
Technical Research Institute of Shougang Group Co. Ltd, Beijing , China |
| LI Min |
Technical Research Institute of Shougang Group Co. Ltd, Beijing , China |
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| Abstract: |
| The work aims to determine the effect of selective oxidation behavior of Si and Mn on the phosphating properties of high strength dual-phase steel surface, so as to improve the phosphating properties of dual-phase steel. The phosphating films were prepared on the surface of samples with different selective oxidation behavior. X-rayphotoelectron spectroscopy (XPS), glow spectrometer(GDS), transmission electron microscopy (TEM) and other means were used to analyze the selective oxidation behavior of Si and Mn elements on the surface of high strength dual-phase steel. The crystalline state of phosphating film was observed by SEM, and the reaction process of steel plate in phosphating solution was analyzed by electrochemical technology. When the content of Si on the surface of high strength steel was low, the oxide mainly existed in the form of dispersed small granular MnAl2O4, which could speed up the acid etching reaction in phosphating solution, and the phosphating grains were uniform, dense and less than 4 mm in size, and the coverage rate was 100%. When the Si content on the surface of high strength steel was high, the formed Mn2SiO4 was easy to aggregate at the grain boundary, and the particle size was large, which slowed down the acid etching reaction speed, and the phosphating grain size was larger than 8 mm, and the uniformity and compactness were poor. However, increasing the concentration of Mn on the surface of the steel could reduce the accumulation of Mn2SiO4 and increase the rate of acid etching reaction, and then the phosphating grains were uniform and dense, with the size less than 4 mm and the coverage rate of 100%. Reducing the enrichment of Si and increasing the enrichment of Mn on the surface of dual-phase high strength steel can accelerate the acid etching reaction of steel plate in phosphating solution and improve the phosphating properties. |
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