Identyfikatory
Warianty tytułu
Examinations of corrosion resistance Al-Si coated tubes to be ussed as elements of exhaust systems. Laboratory researches
Języki publikacji
Abstrakty
W artykule zamieszczono wyniki niestandardowych, specjalnie opracowanych testów, odwzorowujacych warunki pracy układów wydechowych. Próbki taśmy, rur oraz elementów układu wydechowego poddano działaniu zmiennego środowiska pracy w różnych czasie. Stan próbek oceniano wizualnie (dokumentacja fotograficzna) oraz za pomocą skaningowego mikroskopu elektronowego.
Welded pipes with aluminium-silicon coatings are used to manufacture exhaust systems parts because in their case steel strength features are connected with corrosion and high temperature resistance of the coating. Under the conditions of intensive corrosion impact resulting from periodical heating and cooling, and the influence of the environment which contains chloride ions, SO(4)(-) and others, with a different in time thickness of the electrolyte layer, in the presence of contamination having hygroscopic properties, the protective action of the coating is the result of corrosion resistance of passivated aluminium. Silicon addition increases high temperature resistance significantly and diminishes problems of application. The coating contains ca 9 % of Si and has a standard thickness ca 20 mun. As in the case of a fire-applied zinc coating, it has two layers, with an intermediate layer of an alloy of the base and coating components. If the coating, and, especially its alloy layer, leaks, then corrosion cells will be created. In these cells, uncovered steel surfaces having lower electrochemical potential make up anodes. The coating will not provide protection then. The paper presents the results of non-standard, specially prepared tests which reflect working conditions of exhaust systems. Samples of strips, pipes and parts of exhaust systems have been exposed to variable working environment in different times. The tests consisted of two stages: -testing corrosion resistance of the samples under snowy and snow mud conditions, -testing the changes in the coating and base after 40,000 km exploitation of the exhaust system. Samples were evaluated visually (photo documentation) and with a scanning electron microscope.
Wydawca
Czasopismo
Rocznik
Tom
Strony
679--685
Opis fizyczny
rys., fot.
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-AGH2-0004-0026
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