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Bimetallkorrosion i atmosfär- Resultat från ett års fältexponering: Bimetallic corrosion under atmospheric conditions - results from one year field exposure
RISE, Swerea, Swerea KIMAB.
2014 (Swedish)Report (Refereed)
Abstract [sv]

In the suggested revision of the ISO-standard for the determination of bimetallic corrosion in atmospheric exposure corrosion tests, ISO/CD 7441, three types of specimens for measuring bimetallic corrosion are described: rectangular plates, washers and wire-on-bolt. A similar study, using wire-on-bolt specimens, was performed in the 1970’s*). Since it is not possible to manufacture durable wires of all materials of interest, specimens of the washer type were used in this investigation. Additionally, to obtain a comparison between the specimen types, some material combinations were tested using all three types. The field exposures have been performed at three sites: Stockholm Vanadis (low corrosivity urban atmosphere), Bohus Malmön – Kvarnvik (marine atmosphere) and in Borås (road environment with deicing salts). The exposures started in October – December 2011 with inspection in June - August 2012 and withdrawal in October - December 2012. Results obtained in this investigation are basically consistent with results from the exposures in the 70’s. One difference is that corrosion rates are now lower at the urban site, Stockholm Vanadis. Despite this, aluminium showed larger effects from contact with tin this time, the same being true for aluminium in contact with stainless steel or with zinc coated material. Additionally, there were differences between different aluminium alloys. A schematic overview over results obtained is presented. Specimens types described in ISO/CD 7441 differ in sensitivity. Wire-on-bolt type specimens, with the whole anode area close to the cathode, are the most sensitive while rectangular type specimens show the lowest sensitivity due to the large anode size. A disadvantage with wire-on-bolt type specimens is that all materials cannot be obtained as wires and that corroded wires may break. A clear advantage with washer type specimens is that there is no need to know in advance, which material will be the anode and which the cathode. For measuring corrosion rates by mass loss determination, corrosion products are chemically removed. This was found to be a problem since existing procedures are elaborated for metals with their own corrosion products, not always removing corrosion products from the other metal; chemicals removing the extraneous corrosion products may further attack the metal to be investigated.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2014.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2014-120
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13021OAI: oai:DiVA.org:ri-13021DiVA, id: diva2:973215
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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