Materials Performance

DEC 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

Issue link: https://mp.epubxp.com/i/1054874

Contents of this Issue

Navigation

Page 45 of 76

43 MATERIALS PERFORMANCE: VOL. 57, NO. 12 DECEMBER 2018 TABLE 2. FITTING OF EIS OF AA7003 IN NaCl SOLUTION AT DIFFERENT TEMPERATURES CPE dl Aging T (°C) R s (·cm 2 ) Y 0 ( –1 cm –2 s –n = 10 –5 ) N R t (·cm 2 ) R L (·cm 2 ) L (H·cm –2 ) R P (·cm 2 ) PA 30 4.802 7.48 0.9243 1,526 3,880 2,755 954 50 4.401 4.91 0.8944 1,304 2,882 1,288 897 70 4.287 8.06 0.8809 1,038 1,857 1,027 665 DPA 30 5.512 8.82 0.8514 1,530 3,894 3,086 1,098 50 5.112 6.89 0.8941 1,415 4,499 2,196 1,076 70 4.304 8.06 0.8809 1,149 1,987 1,589 665 RRA 30 5.703 13.23 0.7450 2,968 5,026 4,453 1,856 50 4.765 10.44 0.8319 1,763 4,922 2,987 1,298 70 3.842 12.85 0.8812 1,268 2,308 2,058 818 FIGURE 4 Morphologies of corrosion attack of AA7003 (PA) in 3.5 wt% NaCl solution at different temperatures of (a) 30 °C, (b) 50 °C, and (c) 70 °C for 24 h. tion corroded the alloy on the surface, initi- ated pitting, and then the pitting process transported the corrosive solution into the alloy interior, and in time formed the cracks. In addition, it can be seen from Figure 4 that the white corrosion products and cracks increase with increasing temperature. Conclusions 1. The higher the temperature of 3.5 wt% NaCl solution, the higher the AA7003 electrochemical corrosion rate. 2. The effect of aging treatments on the electrochemical corrosion rate in d e s c e n d i n g o rd e r i s a s f o l l o w s : PA>DPA>RRA. Acknowledgment T h e f i n a n c i a l a i d of t h e Na t i o n a l Natural S c i en c e Fo un d ation of C hin a under Grant No. 51871031 is gratefully acknowledged. References 1 W.J. Qi, X. Qi, B. Sun, et al., "Study on Electro- chemical Corrosion of 7050 Aluminum Alloy," MP 56 (2017): pp. 58-61. 2 H.B. Chen, B.Yang, "Effect of Heat Treatment on Micro-Structures and Mechanical Proper- ties of a Bulk Nanostructured Al-Zn-Mg-Cu Alloy," Int. J. Miner. Metall. Mater. 16 (2009): p. 672. 3 N.J.H. Holoroyd, G.M. Scamans, "Stress Cor- rosion Cracking in Al-Zn-Mg-Cu Aluminum Alloys in Saline Environmen," Metall. Mater. Trans. A 44 (2013): pp. 1,230-1,253. 4 X.Y. Z hang, R .G. Song, B. Sun, et al., "Effects of Ap- plied Potentials on Stress Corrosion Cracking Behav- ior of 7003 Aluminum Alloy in Acid and Alkaline Chlo- ride Solutions," Int. J. Miner. Metall. Mater. 23 (2016): pp. 819-826. 5 X. Qi, J.R. Jin, C.L. Dai, et al., "A Study on the Susceptibil- ity to SCC of 7050 Alumi- num Alloy by D CB Speci- mens," Materials 9 (2016): p. 884. 6 R .G. Song, W. Dietzel, B.J. Zhang, et al., "Stress Corro- sion Cracking and Hydrogen Embrittlement of an Al-Zn- Mg-Cu Alloy," Acta Mater. 52 (2004): pp. 4,727-4,743. 7 C.B. Z h en g, B.H. Yan , K. Zhang, et al., "Electrochem- ical Investigation on the Hy- drogen Permeation Behav- ior of 7075-T6 Al Alloy and its Influence on Stress Cor- r o s i o n C ra c k i n g ," In t . J . Mi n e r. Met a l l . Ma t e r . 2 2 (2015): p. 729. 8 I. Sevim, S. Sahin, H. Cug, et al., "Effect of Aging Treat- ment on Surface Roughness, Mechanical Properties, and Fracture Behavior of 6XXX and 7XXX Aluminum Al- loys," Strength Mater. 46 (2014): p. 190. 9 N. Takano, "Hydrogen Diffusion and Embrit- tlement in 7050 Aluminum Alloy," Mater. Sci. Eng. A 483-484 (2008): pp. 336-339. 10 K.S. Ghosh, S. Mukhopadhyay, B. Konar, et al., "Study of Aging and Electrochemical Be- haviour of Al-Li-Cu-Mg Alloys," Mater. Corros. 64 (2013): p. 89. Continued on page 44 Electrochemical Corrosion Behavior of AA7003

Articles in this issue

Archives of this issue

view archives of Materials Performance - DEC 2018