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Corrosion of Aluminium Windows and Doors

Corrosion of Aluminium Windows and Doors ETHODS of corrosion prevention ally attacked if assembled with zinc, used in the United States for galvanised or cadmium-plated steel, cad­ aluminium alloy windows and doors are mium-plated copper alloys or stainless steel. summarised in a report issued by the Office Corrosion is a very complex pheno­ of Technical Services, Washington. An­ menon, however, and it is difficult to lay notated references are given to information down any hard and fast standards on this on the corrosion behaviour of aluminium subject. The alloys mentioned are those windows and doors in marine, industrial whose stability was rated most highly, but and rural atmospheres, and to suitable under many conditions others have also methods of treatment. Data on alloy com­ been successfully used. positions and the utilisation of standard Anodising or other treatments are not sections are also included. in general use on aluminium for window frames because of the cost involved. It is Th e alloys most commonly used in the United States for general structural applica­ important that the sections forming a struc­ tions are 61S and 14S. The yield strength ture should be strong enough and thick of 61S-T6 is about the same as that of enough to withstand distortion when structural steel, a minimum of 35,000 p.s.i., handled and stacked. The joints should although the minimum ultimate tensile be welded and the flux carefully removed. Contact with copper, lead and other strength is only 42,000 p.s.i. The alloy has a resistance to corrosion about equal electro-positive metals in rivets, bolts, etc., to that of pure aluminium. It is easily should be avoided, since this will cause fabricated into the forms that are required severe local corrosion of the aluminium and hence has the advantage of lower cost and early failure in service. than some other alloys. An acrylate liquor is useful for protect­ The effects of marine, industrial and ing the aluminium from corrosion by lime water or mortar solutions until the frame rural atmospheres on several aluminium- is bricked in. Natural weathering pro­ sheet materials have been compared. duces a hard, corrosion-resistant protective Generally speaking, after 10-year tests, rural environments were found to be only surface on aluminium in windows for most slightly corrosive. In these tests, which service conditions. Anodising is used were sponsored by the American Society mainly on architectural panels, where a dull surface appearance is required. for Testing Materials, long-term exposure to industrial and marine atmospheres did If it is desired to modify the appearance not produce significant corrosion of the of aluminium by painting for specific aluminium alloys tested. design effects, phosphating or chromatis- A manual issued by the Reynolds Metals ing treatments have been found useful in improving the adherence of paint, accord­ Co. Inc., Louisville, Kentucky, states that ing to research carried out at the U.S. all commercial wrought aluminium alloys Bureau of Standards for the Housing and are suitable for rural atmospheres. Those Home Finance Agency. recommended for industrial and marine atmospheres respectively are separately For good corrosion resistance the copper listed. Particulars are also given of the content of the aluminium should be kept aluminium alloys most commonly used for low; preferably under 0.4%. extrusions, which contain varying com­ The U.S. Navy suggests that bright binations of such elements as silicon, mag­ aluminium surfaces should be either waxed nesium, copper, chromium, manganese or coated with phenolic varnish, formula and zinc. They are available in various 80. This includes aluminium bins, up­ tempers—solution heat-treated, and arti­ rights, battens and fittings in store or issue ficially aged. Aluminium extrusion alloys rooms, lockers, mess tables, shelves, dres­ containing magnesium, or magnesium and sers and drawers. The surfaces of material silicon rather than copper, and which are most readily accessible for inspection and solution treated rather than heat treated, maintenance should be given two coats of are the most resistant to corrosion attack zinc chromate primer; most other surfaces by salt water and marine atmospheres. require one coat of primer. Where corrosion has occurred in struc­ Where it is necessary to remove surface tures exposed to the atmosphere, the failure contamination or old paint from aluminium cannot be assumed to be solely the result surfaces, mixed spirits, solvent-type paint remover, wire brushing or sandblasting of weathering. Aluminium is quite sus­ are recommended. ceptible to galvanic corrosion. Thus aluminium will usually corrode in assemb­ The decision as to whether aluminium lies with steel, brass, copper, lead, tin or structures should be painted or left exposed nickel, when contaminated water pene­ depends largely on the corrosive effect of the trates into the joint. Galvanic attack is local atmosphere conditions. For this reason most effectively eliminated by using only it is usually advisable to consult an expert. aluminium parts. Where this is impossible, A copy of this report has been received the contacting surface should be insulated by the Technical Information and Docu­ with zinc chromate, or bituminous paints, ments Unit of the Department of Scientific or by gaskets of a corrosion-resistant, non- and Industrial Research, 15 Regent Street, galvanic material. Aluminium is not gener­ London, S.W.1 (ref.: TIDU 0897/58). CORROSION TECHNOLOGY, December 1954 389 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

Corrosion of Aluminium Windows and Doors

Anti-Corrosion Methods and Materials , Volume 1 (10): 1 – Oct 1, 1954

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/eb018999
Publisher site
See Article on Publisher Site

Abstract

ETHODS of corrosion prevention ally attacked if assembled with zinc, used in the United States for galvanised or cadmium-plated steel, cad­ aluminium alloy windows and doors are mium-plated copper alloys or stainless steel. summarised in a report issued by the Office Corrosion is a very complex pheno­ of Technical Services, Washington. An­ menon, however, and it is difficult to lay notated references are given to information down any hard and fast standards on this on the corrosion behaviour of aluminium subject. The alloys mentioned are those windows and doors in marine, industrial whose stability was rated most highly, but and rural atmospheres, and to suitable under many conditions others have also methods of treatment. Data on alloy com­ been successfully used. positions and the utilisation of standard Anodising or other treatments are not sections are also included. in general use on aluminium for window frames because of the cost involved. It is Th e alloys most commonly used in the United States for general structural applica­ important that the sections forming a struc­ tions are 61S and 14S. The yield strength ture should be strong enough and thick of 61S-T6 is about the same as that of enough to withstand distortion when structural steel, a minimum of 35,000 p.s.i., handled and stacked. The joints should although the minimum ultimate tensile be welded and the flux carefully removed. Contact with copper, lead and other strength is only 42,000 p.s.i. The alloy has a resistance to corrosion about equal electro-positive metals in rivets, bolts, etc., to that of pure aluminium. It is easily should be avoided, since this will cause fabricated into the forms that are required severe local corrosion of the aluminium and hence has the advantage of lower cost and early failure in service. than some other alloys. An acrylate liquor is useful for protect­ The effects of marine, industrial and ing the aluminium from corrosion by lime water or mortar solutions until the frame rural atmospheres on several aluminium- is bricked in. Natural weathering pro­ sheet materials have been compared. duces a hard, corrosion-resistant protective Generally speaking, after 10-year tests, rural environments were found to be only surface on aluminium in windows for most slightly corrosive. In these tests, which service conditions. Anodising is used were sponsored by the American Society mainly on architectural panels, where a dull surface appearance is required. for Testing Materials, long-term exposure to industrial and marine atmospheres did If it is desired to modify the appearance not produce significant corrosion of the of aluminium by painting for specific aluminium alloys tested. design effects, phosphating or chromatis- A manual issued by the Reynolds Metals ing treatments have been found useful in improving the adherence of paint, accord­ Co. Inc., Louisville, Kentucky, states that ing to research carried out at the U.S. all commercial wrought aluminium alloys Bureau of Standards for the Housing and are suitable for rural atmospheres. Those Home Finance Agency. recommended for industrial and marine atmospheres respectively are separately For good corrosion resistance the copper listed. Particulars are also given of the content of the aluminium should be kept aluminium alloys most commonly used for low; preferably under 0.4%. extrusions, which contain varying com­ The U.S. Navy suggests that bright binations of such elements as silicon, mag­ aluminium surfaces should be either waxed nesium, copper, chromium, manganese or coated with phenolic varnish, formula and zinc. They are available in various 80. This includes aluminium bins, up­ tempers—solution heat-treated, and arti­ rights, battens and fittings in store or issue ficially aged. Aluminium extrusion alloys rooms, lockers, mess tables, shelves, dres­ containing magnesium, or magnesium and sers and drawers. The surfaces of material silicon rather than copper, and which are most readily accessible for inspection and solution treated rather than heat treated, maintenance should be given two coats of are the most resistant to corrosion attack zinc chromate primer; most other surfaces by salt water and marine atmospheres. require one coat of primer. Where corrosion has occurred in struc­ Where it is necessary to remove surface tures exposed to the atmosphere, the failure contamination or old paint from aluminium cannot be assumed to be solely the result surfaces, mixed spirits, solvent-type paint remover, wire brushing or sandblasting of weathering. Aluminium is quite sus­ are recommended. ceptible to galvanic corrosion. Thus aluminium will usually corrode in assemb­ The decision as to whether aluminium lies with steel, brass, copper, lead, tin or structures should be painted or left exposed nickel, when contaminated water pene­ depends largely on the corrosive effect of the trates into the joint. Galvanic attack is local atmosphere conditions. For this reason most effectively eliminated by using only it is usually advisable to consult an expert. aluminium parts. Where this is impossible, A copy of this report has been received the contacting surface should be insulated by the Technical Information and Docu­ with zinc chromate, or bituminous paints, ments Unit of the Department of Scientific or by gaskets of a corrosion-resistant, non- and Industrial Research, 15 Regent Street, galvanic material. Aluminium is not gener­ London, S.W.1 (ref.: TIDU 0897/58). CORROSION TECHNOLOGY, December 1954 389

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Oct 1, 1954

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