Corrosion behaviors cold spraying Zn-Al composite coating in 3.5 wt.% NaCl solution

Abstract

Abstract: The Zn-Al composite coating with different Al content had been deposited on the surface of Q235 steel by low pressure cold spraying. The corrosion potential, impedance value and corrosion current density of Zn-Al composite coating in 3.5 wt.% NaCl solution were analyzed by means of open-circuit potential and polarization curves. The morphology of the coating and the content of elements in the specific area were characterized by scanning electron microscope with energy dispersive spectrometer, X-ray diffractometer was used to analyze the coating phase after corrosion in 3.5wt.% NaCl solution for 1 440 h. The results showed that the corrosion resistance of the coating is better with the increase of Al content in 3.5 wt.% NaCl solution, and the corrosion resistance of the coating is better when the Al content is greater 35%. Because corrosion of zinc is prior than that of Al element, and the stable oxidation film is formed, at the same time, Al element inhibits the activity of zinc to slow down the corrosion rate, and the higher Al content has the better results. The corrosion mechanism of Zn-Al composite coating in 3.5 wt.% NaCl solution is uniform corrosion, pitting, local pitting and self-sealing of corrosion products.

Key words: cold-spray, Zn-Al composite coating, Al content, corrosion resistance, corrosion mechanism

CLC Number:

TG174.4

SUN Yong-jiang, ZHANG Jin-ling, ZHAI Hai-min, WANG Hai-peng, LI Wen-sheng. Corrosion behaviors cold spraying Zn-Al composite coating in 3.5 wt.% NaCl solution[J]. Journal of Lanzhou University of Technology, 2023, 49(2): 17-23.

References

[1] 张波,王晓乾,董彩常,等.青岛海洋大气中桥梁结构钢的腐蚀模型对比研究 [J].公路交通科技,2013,30(1):69-73.
[2] MA Y T,LI Y,WANG F H.Corrosion of low carbon steel in atmospheric environments of different chloride content [J].Corrosion Science,2009,51(5):997-1006.
[3] 邢龙森.基于船舶压载舱防腐的冷喷涂锌铝涂层制备及性能研究 [D].厦门:集美大学,2017.
[4] 张晗,百秀琴,贺小燕,等.船用Q235碳钢的海洋微藻附着诱导微生物腐蚀特性 [J].机械工程材料,2020,44(4):7-15.
[5] 李群波,杨春燕,周永璋.M24油田采出液系统的腐蚀行为与缓蚀剂的研究 [J].全面腐蚀控制,2010,24(10):45-48.
[6] CHIDIEBERE M A,OGUZIE E E,LIU L,et al.Adsorption and corrosion inhibiting effect of riboflavin on Q235 mild steel corrosion in acidic environments [J].Materials Chemistry and Physics,2015,156:95-104.
[7] 王悦,李慧,梁精龙,等.Q235钢的腐蚀行为及表面防腐研究现状 [J].电镀与涂装,2019,38(11):545-548.
[8] 文丽娟,高志明,刘洋洋,等.阴极保护电位对Q235钢氢脆敏感性和力学性能的影响 [J].中国腐蚀与防护学报,2013,33(4):271-276.
[9] 陈永雄,徐滨士,许一,等.热喷涂Zn-Al合金防腐涂层技术的研究进展 [J].材料导报,2006,20(4):70-73.
[10] HEGDE A C,VENKATAKRISHNA K,ELIAZ N.Electrodeposition of Zn-Ni,Zn-Fe and Zn-Ni-Fe alloys [J].Surface and Coatings Technology,2010,205(7):2031-2041.
[11] SHIH H C,HSU J W,SUN C N,et al.The lifetime assessment of hot-dip 5% Al-Zn coatings in chloride environments [J].Surface and Coatings Technology,2002,150:70-75.
[12] KIM S J,LEE S J.Effects of F-Si sealer on electrochemical characteristics of 15%Al-85%Zn alloy thermal spray coatings [J].Transactions of Nonferrous Metals Society of China,2011,21(12):2798-2804.
[13] 杨立稳,李相波,程旭东,等.不同基体低压冷喷涂铝合金涂层性能研究 [J].材料导报,2015,29(S2):73-77.
[14] 章华兵,单爱党,魏仑,等.冷气动力喷涂涂层结合机理及工艺研究进展 [J].材料导报,2007(4):80-83.
[15] ASSADI H,KREYE H,GARTNER F,et al.Cold spraying-a materials perspective [J].Acta Materia,2016,116:382-407.
[16] STOLTENHOFF T,KREYE H,RICHTER H J.An analysis of the cold spray process and its coatings [J].Journal of Thermal Spray Technology,2002,11(4):542-550.
[17] 李海洋,李相波,孙明先,等.冷喷涂Zn-50Al复合涂层在海水中的耐蚀性能 [J].中国腐蚀与防护学报,2010,30(1):62-66.
[18] PYUN S I,LEE W J.The effect of prior Cl-ion incorporation into native oxide film on pure aluminum in neutral chloride solution on pit initiation [J].Corrosion Science,2001,43(2):353-363.
[19] SHI Z M,SONG G L,CAO C N,et al.Electrochemical potential noise of 321 stainless steel stressed under constant strain rate testing conditions [J].Electrochim Acta,2006,52(5):2123-2133.
[20] 蒋穹,高欣,季铁安,等.纳米微粒增强水性无铬锌铝合金涂层的制备及特性 [J].中国表面工程,2018,31(3):123-130.
[21] 张鉴清,曹楚南.电化学阻抗谱方法研究评价有机涂层 [J].腐蚀与防护,1998,19(3):99-104.
[22] 白杨,王振华,李相波,等.低压冷喷涂制备Al(Y)-30%Al₂O₃涂层及其海水腐蚀行为 [J].金属学报,2019(10):1338-1348.
[23] LIU Y,LI H Y,LI Z G.EIS Investigation and structural characterization of different hot-dipped zinc-based coatings in 3.5% NaCl solution [J].International Journal of Electrochemical Science,2013,8(6):7753-7767.
[24] ODNEVALL I,LEYGRAF C.Formation ofNaZn₄Cl(OH)₆SO₄·6H₂Oin a marine atmosphere [J].Corrosion Science,1993,33(8):1213-1229.