| NI Ya,WU Guo-guang,YAN Yuan-fang,ZHOU Chun-xia.Properties of Zn-Cu-Ti Wires and Their Metal Coating for New Arc Spraying[J],47(2):182-188 |
| Properties of Zn-Cu-Ti Wires and Their Metal Coating for New Arc Spraying |
| Received:September 20, 2017 Revised:February 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.02.029 |
| KeyWord:Zn-Cu-Ti alloy wire metallic coating anti-corrosion electrochemistry characterization |
| Author | Institution |
| NI Ya |
1.School of Chemical Engineering & Technology, China University of Mining & Technology, Xuzhou , China; 2.Jiangsu CUMT Dazheng Surface Engineering Technology Co. Ltd, Xuzhou , China |
| WU Guo-guang |
School of Chemical Engineering & Technology, China University of Mining & Technology, Xuzhou , China |
| YAN Yuan-fang |
Jiangsu CUMT Dazheng Surface Engineering Technology Co. Ltd, Xuzhou , China |
| ZHOU Chun-xia |
Jiangsu CUMT Dazheng Surface Engineering Technology Co. Ltd, Xuzhou , China |
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| Abstract: |
| The work aims to develop an electric arc spraying alloy wire of steel structure requiring no maintenance or less maintenance during service period. Optimum formula of the new Zn-Cu-Ti alloy wire was determined based upon binary phase diagram and exploratory experiment. Corrosion resistance of the coating was studied by performing salt spray test and electrochemical experiment. Surface morphology of the original and corroded metallic coating was observed with SEM. Chemical composition of the coating surfaces under different corrosion conditions was characterized with XRD. The coating surfaces were completely passivated after immersion in 3.5%NaCl corrosion solution for 10 days, and effects of corrosion solution on the coatings tended to be stable. Corrosion rate began to decrease as salt spray test lasted 1080 h, and reduced to the lowest rate, 0.044 g/(m2•h) at 2160 h. Due to negative corrosion potential of the new Zn-Cu-Ti coating, a passive film might take shape and protect the substrate as a result of oxidizing reaction in a short time. The XRD spectra of the corroded coating showed that Zn oxides were present at 2θ=36.4°, 39.1° and 54.1°. Main oxides included Zn(OH)2 and Zn(OH)8Cl2•H2O, and peak intensity of each element gradually decreased as corrosion time prolonged. The metallic coating made from new Zn-Cu-Ti alloy wire exhibits excellent corrosion resistance. |
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