The stress corrosion cracking of 70Cu-30Zn brass in chlorate solutions

Maria, M. Saenz de Santa; Scully, J.C.

doi:10.1016/0010-938x(83)90038-0

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…The SCC is often intergranular, but transgranular cracking may occur in some alloys in certain environment. [53][54][55][56] Aside from an applied mechanical stress, a residual, thermal, or welding stress along with the appropriate aggressive agent may also be sufficient to promote SCC. It has long been believed that de-alloying is involved in the stress corrosion process in brass.…”

Section: Stress Corrosion Crackingmentioning

confidence: 99%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

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Copper is widely used in many applications such as heat exchangers, condensers, heating and air conditioning systems, electricity, electronic circuitry and ornamental parts. This paper reviews the issue of copper corrosion in different environments and applications. Special attention is paid to the influence of relative humidity and low molecular weight carboxylic acids. These acids are present in rain, snow, clouds and particulate matter and contribute about 15-35% of rain acidity. Attention is also paid to copper corrosion originated by formic, acetic, propionic and butyric acid vapours. Corrosion product layers (patina) are analysed, showing the relationship between potential and current density cathodic peaks, and models are proposed that show a proportionality factor of the dimensions of a resistor. These results are of practical importance in copper roofing applications. Before 1985, copper was almost universally considered to be a corrosion resistant conduit of potable water, and few instances of copper tube failure were reported. Where unacceptable performance was identified, the problem was usually attributed to reticulation and plumbing systems. In air conditioning applications, premature failure of copper tubing frequently occurs due to pitting corrosion after a short time in service or even during postinstallation leakage tests. This type of corrosion is described in the literature as formicary corrosion, and its morphology is characterised by microscopic caverns connected by tunnels. Specimens are analysed to assess the reasons for such premature corrosion failure. Finally, procedures to mitigate copper corrosion are addressed. Pickling in dilute mineral acids (H 2 SO 4 and HCl) is discussed as the most common method for removing oxides formed on the surface of copper based materials during mill processing and manufacturing operations. The use of corrosion inhibitors, such as immersion corrosion inhibitors and volatile corrosion inhibitors (VCI), is a widespread practice to reduce copper corrosion, achieving significant delays in the corrosion process. Reference is made to the search for new environmentally friendly inhibitors for copper and bronze using organic compounds in acid, neutral and alkaline media, and a number of ecological alternatives are reviewed.

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Section: Stress Corrosion Crackingmentioning

confidence: 99%

Copper deterioration: causes, diagnosis and risk minimisation

Bastidas¹,

Criado²,

Fajardo³

et al. 2010

International Materials Reviews

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“…However, so far, little is known about the behavior of brass in fluoride solutions. 15 Consequently, the susceptibility of a-brass to SCC in fluoride solutions has been determined in this work as a function of fluoride concentration and applied potential. Attempts have also been made to establish the mechanism of SCC by comparing the behavioral information with potentiodynamic polarization test data.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Critical Potentials for Pitting, Protection, and Stress Corrosion Cracking of 67‐33 Brass in Fluoride Solutions

Lee

Shih

1995

J. Electrochem. Soc.

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Pitting potentials E~, and protection potentials, E~p, have been determined for a-brass (33% Zn) using a cyclic polarlzahon method. Increasing the F concentratmn shlJ~s the crlhcal potential to more active values. The pitting potentials, Ep, and protection potentials, Ep depend on the logarithmic concentration of F-ions according to the equations: Ep = a + b log [F ] and Epp = a + b log [F ~. Slow strain rate tests (SSRT), at a strain rate of 5 • 10 5 s-~, were performed under open-circuit and potentiostatic conditions to study the stress corrosion cracking (SCC) characteristics of the a-brass in NaF solutions of various concentrations (pH 6.8) at 25~ The minimum concentration of NaF that caused intergranular stress corrosion cracking (IGSCC) was 1 • 10-4M. This concentration, was also the critical level for repassivation, observed in cyclic polarization tests. These results demonstrate a good correlation between the electrical and the mechanical breakdown of the passive film. In the presence of 10 ~M NaF the potential range for IGSCC was -150 to -50 mV (SCE). These critical potentials were restricted to the stable passive potential range and also fell within the potential-pH region where Cu~O was stable. The formation of a Cu20 film on the brass after polarization in the passive region was confirmed by x-ray diffraction (XRD). At more noble potentials and at cathodic potentials below the Cu20 domain, the failure mode was ductile fracture. These observations of IGSCC of the brass in fluoride solutions support a film rupture-dissolution mechanism.

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“…U radu [Saenz De Santa Maria,M., Scully,J., 1983] utvrđene su transkristalna i interkristalna naponska korozija mesinga 70Cu-30Zn u hloratnom rastvoru.…”

Section: Naponska Korozija Mesingaunclassified

Investigation of brass corrosion process in sodium sulfate solution

Avramović¹

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Ispitivanje procesa korozije mesinga u rastvoru natrijim sulfata Rezime Bakar ubrajamo u grupu najvažnijih obojenih metala, koji ima veoma široku komercijalnu (tehničku) primenu. Poznat je od davnina, jedan od prvih elemenata koje je upoznao čovek. Značaj koji su imali bakar i njegove legure, ogleda se u nazivima čitavih epoha u razvoju čovečanstva. Arheološki nalazi bakarnih predmeta u borskoj okolini potiču iz bakarnog doba i ukazuju na korišćenje samorodnog bakra od koga su se izrađivale bakarne alatke, nakit, oružje, a kao poseban raritet tog doba (eneolitsko doba) pominje se bakarna sekira. Zahvaljujući svojim vrlo dobrim konstrukcionim osobinama, a pre svega fizičkim, a zatim i srazmerno znatnoj rasprostranjenosti u prirodi (iako količina bakra u zemljinoj kori iznosi svega 0.01%), bakar je jedan od metala koji je našao najširu primenu, odmah posle železa. Glavno područje primene bakra je elektroindustrija, nešto manje bakra se upotrebljava u obliku proizvoda dobijenih preradom u plastičnom, i to kako u tehnički čistom obliku, tako i u obliku legura. Bakar i njegove legure, pre svih mesing, nalaze široku primenu zbog svojih fizičkih i hemijskih osobina. Korozija predstavlja specifičan proces koji uključuje gubitak ili degradaciju metalnih komponenti i obično je elektrohemijske prirode, sa velikom primenom kod galvanskih ćelija. Korozija je dezintegracija metala pomoću nenamernih hemijskih ili elektrohemijskih reakcija, koja počinje sa površine. Svi metali imaju tendenciju oksidacije, neki lakše od drugih. Sklonost ka oksidaciji formira galvanski niz. Poznavanje mesta metala u galvanskom nizu važna je informacija za razumevanje i njegovu moguću upotrebu u konstruisanju i prilikom kontakata različitih metala.Kvalitetan inženjering zahteva razumevanje kompatibilnosti materijala. Često postoje zahtevi da različiti metali budu u kontaktu i tada galvanska kompatibilnost dovodi do patiniranja površine jednog od metala i njegove zaštite od dalje korozije.U legurama mesinga količina cinka kreće se od 5-45%. Uopšteno, koroziona otpornost mesinga opada sa povećanjem količine cinka. To je uobičajena različitost između onih legura koje sadrže manje od 15% cinka (bolja koroziona otpornost) i onih sa većom količinom cinka. Glavni problemi kod legura sa visokom koncentracijom cinka su procesi decinkacije i naponske korozije (Stress Corrosion Cracking-SCC).U ovom radu dato je tumačenje korozionog ponašanja dve vrste mesinga (CuZn-28 i CuZn-42), sa pet stepeni deformacija (0, 20, 40, 60 i 80%), u različitim korozionim sredinama. Ispitivanja su vršena elektrohemijskim postupkom, potenciostatskom metodom. Određene su zavisnosti potencijala od vremena i korozioni potencijali, kao i zavisnosti gustina korozionih struja od potencijala. Izmerene vrednosti korozionih potencijala i gustina korozionih struja posmatrani su kao karakteristike procesa decinkacije i korozione otpornosti ispitivanih uzoraka hladno-deformisanih uzoraka mesinga CuZn-42 i CuZn-28. Kao radni elektrolit korišćen je 0.1M rastvor Na 2 SO 4 , u koji su dodavani h...

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The stress corrosion cracking of 70Cu-30Zn brass in chlorate solutions

Cited by 9 publications

References 9 publications

Copper deterioration: causes, diagnosis and risk minimisation

Copper deterioration: causes, diagnosis and risk minimisation

Determination of the Critical Potentials for Pitting, Protection, and Stress Corrosion Cracking of 67‐33 Brass in Fluoride Solutions

Investigation of brass corrosion process in sodium sulfate solution

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