Intergranular stress corrosion cracking of copper – A case study

Kuźnicka, Bogumiła; Junik, Krzysztof

doi:10.1016/j.corsci.2007.05.014

Cited by 31 publications

(10 citation statements)

References 17 publications

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“…After ammonia formation the following possible reaction takes place (Todt et al, 1961;Mori et al, 2005 The enhancement of anodic current in polarization study can be explained that the corrosion on cupronickel is due to the oxidation of Cu(OH) 2. Besides, the inter granular attack is formed due to over saturation of the [Cu (NH 3 ) 4 ] 2+ ions (Kirchberg et al,2001;Mori et al, 2005 andKuznika andJunik , 2007 Formation of CuO at the metal surface is the critical step for the occurrence of stress corrosion cracking (SCC) that was noticed on XRD which supports with the observation made by Mori et al (2005).…”

Section: Atomic Force Microscopesupporting

confidence: 75%

“…When the alloys stressed in tension is also exposed to a corrosive environment, the ensuring localized electrochemical dissolution of metal, combined with localized plastic deformation, opens up a crack (Agarwal et al, 2002). Protective films that form at the tip of the crack rupture, causing fresh anodic material to be exposed to the corrosive medium and SCC is propagated (Kuźnicka and Junik, 2007).…”

Section: Atomic Force Microscopementioning

confidence: 99%

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Impact of ammonia producing Bacillus sp. on corrosion of cupronickel alloy 90:10

et al. 2009

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The objective of the present investigation is characterization of ammonia producing bacteria (Bacillus sp.) and its impact on biodeterioration of cupronickel alloy 90:10. It is well known that iron sulphate and molybdenum are good inhibitors used in cooling water system. The role of interaction between inhibitor and ammonia producing bacteria on corrosion of cupronickel 90:10 was studied. Cupronickel coupons were immersed in Chavara rare earth containing backwater for a period of six months. The predominated ammonia producing bacteria were isolated from the six months old biofilm. A total of four ammonia producing Bacillus sp. (AG1-EU202683; AG2-EU202684; AG3-EU202685 and AG4-EU202686) were isolated from the biofilm and identified by 16S rRNA gene sequencing. The corrosion rate of cupronickel in water (System I) was in the range of 0.046mm/year and 0.052mm/year. In the control system II (Chavara water and nitrogen free medium without bacteria), the corrosion rate was 0.008 mm/year whereas in the presence of Bacillus sp. AG1 and AG3, the corrosion rate was in the range of 0.023 and 0.030mm/year. These bacteria fixed atmospheric nitrogen for their cell protein synthesis and converted into ammonia. Ammonia enhanced pH and ammonical solution was formed in the presence of Bacillus sp. that acted as an etchant. The presence of some anodic spots in the presence of bacteria was affected by ammonia and underwent pitting 2 corrosion. The present study reveals that Bacillus sp. encourage intergranular attack without any stress to the cooling water system.

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Section: Atomic Force Microscopesupporting

confidence: 75%

Section: Atomic Force Microscopementioning

confidence: 99%

Impact of ammonia producing Bacillus sp. on corrosion of cupronickel alloy 90:10

et al. 2009

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“…The copper material (Cu-DHP) and the tube dimensions were in accordance with the specifications, so they were not the reason for the failure. All the other relevant failure mechanisms were also out of the question, although some of the observed features were quite similar to those of stress corrosion cracking [27][28][29][30][31]. Ant-nest corrosion occurs especially in Cu-DHP [3,6] which was the material of the heat exchanger tube in question.…”

Section: Discussionmentioning

confidence: 93%

Failure analysis of a copper tube in a finned heat exchanger

Peltola

Lindgren

2015

Engineering Failure Analysis

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“…In vapor test conditions, acetic acid has a higher corrosion rate than formic acid in copper tube [ 17 ]. However, in some conditions, ANC phenomena have a closeness to stress corrosion cracking and stress cracking [ 7 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Mechanism behind ‘Ant Nest’ Corrosion on Copper Tube

Situmorang

Kawai

2018

Materials

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A research investigation of “ant nest” corrosion (ANC) on copper tube was conducted in terms of the variables of the corrosion potential and pH value in 103 ppm copper formate solution over 20 days. The paper presents the surface and cross-sectional observations and examines Cu2O and H2O as the stable chemical species produced. A Cannizzaro reaction as a disproportionation reaction from formic acid and a comproportionation reaction from the metallic copper tube and copper formate solution critically influenced the ANC mechanism. The paper also categorizes the ANC attack as a rapid reaction system from the electrochemical point of view by using a polarization resistance curve.

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Intergranular stress corrosion cracking of copper – A case study

Cited by 31 publications

References 17 publications

Impact of ammonia producing Bacillus sp. on corrosion of cupronickel alloy 90:10

Impact of ammonia producing Bacillus sp. on corrosion of cupronickel alloy 90:10

Failure analysis of a copper tube in a finned heat exchanger

Investigating the Mechanism behind ‘Ant Nest’ Corrosion on Copper Tube

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