Diffusion of hydrogen into the crack wall metal in corrosion cracking of Al-Zn-Mg-Cu alloy

1987 ◽  
Vol 22 (5) ◽  
pp. 457-461
Author(s):  
O. D. Smiyan
Keyword(s):  
Corrosion Cracking ◽  
Cu Alloy ◽  
Crack Wall ◽  
Diffusion Of Hydrogen

scholarly journals Stress Corrosion Cracking of Al-4%Cu Alloy Aged with Stressing

1980 ◽  
Vol 29 (11) ◽  
pp. 545-550
Author(s):  
Akinori Sato ◽  
Kenzo Kon ◽  
Shigeo Tsujikawa ◽  
Yoshihiro Hisamatsu
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Cu Alloy

Effect of Trace Element Erbium on Corrosion Resistance Properties of Al-Zn-Mg-Cu Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 663-667 ◽  
Author(s):  
Xu Dong Wang ◽  
Zuo Ren Nie ◽  
Shuang Ping Lin ◽  
Xue Kuan Su ◽  
Ze Bing Xing
Keyword(s):  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Intergranular Corrosion ◽  
Corrosion Test ◽  
Optical Microscope ◽  
Corrosion Cracking ◽  
Cracking Resistance ◽  
Cu Alloy ◽  
As Stress

The intergranular corrosion and stress corrosion cracking resistance of Al-Zn-Mg-Cu alloy with trace Er addition were studied by means of such methods as stress corrosion cracking and intergranular corrosion test in GB-T7998-2005 and HB5254-83. The microstructures were observed by optical microscope and scanning electron microscope (SEM). The results show that alloys with trace Er addition have been improved on intergranular corrosion and stress corrosion cracking resistance, but corrosion resistance of alloys can be descending when Er addition exceed 0.4%.

scholarly journals Prospecting Stress Formed by Hydrogen or Isotope Diffused in Palladium Alloy Cathode

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2101
Author(s):  
Gilbert Bellanger
Keyword(s):  
Porous Material ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Palladium Alloy ◽  
Material Support ◽  
Mechanical Constraints ◽  
Transient Complex ◽  
Cathode Structure ◽  
Diffusion Of Hydrogen

The objective of this project is to take into account the mechanical constraints formed by diffusion of hydrogen or tritium in watertight palladium alloy cathode. To know the origin of these, it was necessary to discriminating the damaging effects encountered. Effectively, hydrogen and isotope induce deformation, embrittlement, stress corrosion cracking and cathodic corrosion in different regions of cathode. Palladium can be alloyed with silver or yttrium to favourably increase diffusion and reduce these constraints. Effects of electrochemical factors, temperature, cathode structure, adsorbed transient complex of palladium and porous material support are given to estimate and to limit possible damage.

scholarly journals Re-Aging Heat Treatment to Stress Corrosion Cracking Resistance on Al-Zn-Mg-Cu Alloy

2009 ◽  
Vol 6 (2) ◽  
pp. 1
Author(s):  
Rasdi Deraman ◽  
Mohd Rozaiman Aziz ◽  
Yusli Yaakob
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Weight Ratio ◽  
High Strength ◽  
Heat Treatments ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Cu Alloy

The Al-Zn-Mg-Cu alloy is classified as a high strength to weight ratio material and is widely used in the aerospace structures. This alloy is susceptible to severe localized corrosion induced by heat treatment. The objective of this study is to elucidate alternative heat treatment techniques, which reduce the alloys susceptibility to Stress Corrosion Cracking (SCC). A series of different heat treatments have been performed in the Al-Zn-Mg-Cu alloy using cube shaped and C-ring specimens that had been T6- and T7-tempered and undergone Retrogression and Re-aging (RRA) heat treatments. The specimens were exposed to hardness testing, optical testing and immersion testing in a corrosive environment. The effectiveness of the heat treatments was evaluated with respect to improvements in corrosion resistance and the longevity of the Al-Zn-Mg-Cu alloy. The susceptibility of the Al-Zn-Mg-Cu alloy to SCC has been directly related to the precipitation of MgZn2 particles at the grain boundaries. Precipitation hardening of Al-Zn-Mg-Cu alloy increases the hardness of the material, but increases susceptibility to SCC failure. RRA treatment greatly improved the corrosion resistance and longevity of the alloy combined with minimal strength reduction.

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