Effect of Repair Welding on Electrochemical Corrosion and Stress Corrosion Cracking Behavior of TIG Welded AA2219 Aluminum Alloy in 3.5 Wt Pct NaCl Solution

Abstract The stress corrosion cracking (SCC) behavior of U-3/4% Ti, and uranium alloys 3/4% Quad, 1% Quad, and 1% Quint have been studied utilizing a linear elastic fracture mechanics approach. The threshold stress intensities for stress corrosion crack propagation for these alloys have been determined in distilled H2O and NaCl solutions containing 50 ppm Cl− and 21,000 ppm Cl−. All of the alloys studied may be classified as very susceptible to SCC in aqueous solutions since they exhibit SCC in distilled H2O (<1 ppm Cl−) and have low KIscc values in NaCl solutions. Crack extension in all of the alloys in all environments was transgranular and failure occurred by brittle quasicleavage fracture in NaCl solution.

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Effect of pH on Stress Corrosion Cracking of 6082 Al Alloy

Metals ◽

10.3390/met8080578 ◽

2018 ◽

Vol 8 (8) ◽

pp. 578 ◽

Cited By ~ 4

Author(s):

C. Panagopoulos ◽

Emmanuel Georgiou ◽

K. Giannakopoulos ◽

P. Orfanos

Keyword(s):

Aluminum Alloy ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

Al Alloy ◽

Cracking Behavior ◽

Effect Of Ph ◽

Cracking Mechanisms ◽

6082 Aluminum Alloy ◽

6082 Al Alloy

In this work, the effect of pH (3, 7 and 10) on the stress corrosion cracking behavior of 6082 aluminum alloy, in a 0.3 M sodium chloride (NaCl) aqueous based solution was investigated. The stress corrosion cracking behavior was studied with slow strain rate testing, whereas failure analysis of the fractured surfaces was used to identify the dominant degradation mechanisms. The experimental results clearly indicated that stress corrosion cracking behavior of this aluminum alloy strongly depends on the pH of the solution. In particular, the highest drop in ultimate tensile strength and ductility was observed for the alkaline pH, followed by the acidic, whereas the lowest susceptibility was observed in the neutral pH environment. This observation is attributed to a change in the dominant stress corrosion cracking mechanisms.

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Stress Corrosion Cracking Behaviour of Flux Bounded TIG Welded AA2219 T87 Aluminum Alloy in 3.5 Weight Percent NaCl Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.766-767.733 ◽

2015 ◽

Vol 766-767 ◽

pp. 733-738

Author(s):

A.V. Santhana Babu ◽

P.K. Giridharan ◽

A. Venugopal ◽

P. Ramesh Narayanan ◽

S.V.S. Narayana Murty

Keyword(s):

Aluminum Alloy ◽

Strain Rate ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Weight Percent ◽

Corrosion Cracking ◽

Slow Strain Rate Test ◽

Nacl Solution ◽

Test Technique ◽

Rate Test

Limitation in penetration depth is a concern in conventional TIG welding. To improve penetration capability of TIG process, Flux Bounded TIG (FBTIG) has been developed. Stress corrosion cracking (SCC) behavior of FBTIG welds of aluminum alloy AA 2219 T87 is evaluated in 3.5 weight percent NaCl solution using Slow Strain Rate Test technique (SSRT) as per ASTM G129. SCC index defined as the ratio of the elongation of tensile tested specimen in NaCl to that of air is taken as a measure of the susceptibility to cracking. Based on the SCC index, it is concluded that the SCC resistance of FBTIG joints are good and comparable to that of conventional TIG welds.

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