Conversion coatings on magnesium alloys' surface

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F11%3APU96738" target="_blank" >RIV/00216305:26310/11:PU96738 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Conversion coatings on magnesium alloys' surface

Popis výsledku v původním jazyce

Magnesium alloys are one of the important structural materials. Problem is that corrosion rate of these materials is really high. Conversion coatings are of themost effective protection against corrosion. Surface of of the magnesium alloys AZ31, AZ61 andAZ91 was treated by phosphate-permanganate and chromate conversion coatings. Chromate is one of the suitable way of conversion coating, but it cannot be used of carcinogenic Cr(VI). In our case, chromate conversion coating was taken as standard. Magnesium alloy AZ91 contains approximately 9 % of alluminium, which causes formation of phase Mg17Al12. This phase is larger in AZ91 than in AZ31 and AZ61. Phase Mg17Al12 has the highest electrochemical potential, so it behaves like cathode in magnesium alloy.It seems that the higher contens of phase Mg17Al12 cause the bigger micro-cells and the electrochemical corrosion is more significant.

Název v anglickém jazyce

Conversion coatings on magnesium alloys' surface

Popis výsledku anglicky

Magnesium alloys are one of the important structural materials. Problem is that corrosion rate of these materials is really high. Conversion coatings are of themost effective protection against corrosion. Surface of of the magnesium alloys AZ31, AZ61 andAZ91 was treated by phosphate-permanganate and chromate conversion coatings. Chromate is one of the suitable way of conversion coating, but it cannot be used of carcinogenic Cr(VI). In our case, chromate conversion coating was taken as standard. Magnesium alloy AZ91 contains approximately 9 % of alluminium, which causes formation of phase Mg17Al12. This phase is larger in AZ91 than in AZ31 and AZ61. Phase Mg17Al12 has the highest electrochemical potential, so it behaves like cathode in magnesium alloy.It seems that the higher contens of phase Mg17Al12 cause the bigger micro-cells and the electrochemical corrosion is more significant.

Druh

O - Ostatní výsledky

CEP obor

JK - Koroze a povrchové úpravy materiálu

OECD FORD obor

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Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů