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potassium sulfide solution is an ionic compound represented by the chemical formula K2S. It is moderately water and acid soluble. It is deliquescent and may ignite spontaneously in air. It is orange or red in color and is used for staining and coloring bronze and other metals, as a photographic toner, and as an ingredient in black powder pyrotechnic effects. It is also used to produce sulfur dioxide, a toxic gas. Synonyms for potassium sulfide include hepar sulfuris, liver of sulfur, and sulfurated potash.

Potassium has a valence of 1 and is placed in group 1 of the periodic table. Sulfur, on the other hand, has a valence of -2 and is placed in group 16 of the periodic table. To make the sulfide ion neutral, it requires two potassium (K+) ions to compensate for its negative charge of -2. Thus, the formula for potassium sulfide becomes,$K2S+$.

The electrochemical behavior of copper electrode in 2M potassium sulfide solution was studied using cyclic voltammograms and potentiostatic polarization techniques. Three anodic peaks were observed in the anodic scan of cyclic voltammograms. SEM and EDAX analyses showed that a Cu2S layer was formed on the copper surface. This sulfide layer does not passivate the copper.

Moreover, the copper sulfide layer has a high conductivity and is stable in the solution. This study shows that potassium sulfide can be a good alternative to hydrofluoric acid for the treatment of corrosion problems on copper alloys.

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