Meisterprüfung Spengler Practice Questions - Meisterprüfung Für Das Handwerk Spengler (Austrian Master Craftsman Examination In Sheet Metal & Tinsmithing) Exam

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When newly installed bright titanium zinc (walzblankes Titanzink) is exposed to the atmosphere, what multi-stage chemical reaction leads to the formation of its natural protective patina?

Zinc reacts directly with atmospheric nitrogen to form a ceramic-like zinc nitride (Zn3N2) passivation film Zinc reacts with atmospheric moisture to form zinc hydroxide (Zn(OH)2), which then reacts with atmospheric carbon dioxide (CO2) to form insoluble basic zinc carbonate (ZnCO3 · 2Zn(OH)2) Zinc reacts with sulfur dioxide to form water-soluble zinc sulfate (ZnSO4), which crystallizes permanently on the surface Zinc oxidizes with pure atmospheric oxygen into zinc peroxide (ZnO2), which prevents further electron transfer

Correct Answer:

Zinc reacts with atmospheric moisture to form zinc hydroxide (Zn(OH)2), which then reacts with atmospheric carbon dioxide (CO2) to form insoluble basic zinc carbonate (ZnCO3 · 2Zn(OH)2)

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