Corrosion Of In Coated Steel And Tin Coated Steel Procedure Fill Half Of The Test Tube With Distilled Water Add 3 Or 1 (89.75 KiB) Viewed 38 times
Corrosion of in coated steel and tin coated steel. Procedure. Fill half of the test tube with distilled water, add 3 or 4 drops of IM (2n) sulfuric acid solution and 3 or 4 drops of potassium ferricyanide (K3[Fe(CN)6]) solution. The obtained solution divide among two test tubes. Add a bit of zinc plated steel in one of them and a bit of tin plated steel in the second. After several minutes, note the changes in colour of the solution. In which case does steel corrode? Write the equations for the reactions in the galvanic cell zinc- iron and tin-iron. Identify the substance oxidized and the substance reduced. Note: Fe2+ can be identified by the reaction: 3 Fe2+ + 2 K3[Fe(CN)6] Fe3[Fe(CN)6]2 +6K Dark blue colour Observations: Galvanic cell scheme: Galvanic cell scheme: HE Anode: Anode: Cathode: Cathode: Conclusions:
METAL CORROSION AND CORROSION PREVENTION Corrosion of zinc in the junction with copper. Procedure. Pour 2ml of 0.2M sulfuric acid solution into the test tube and add a bit of zinc. Could you observe the evolution of hydrogen gas? Dip copper wire into acidic solution. Be careful not to touch zinc. Could you observe the evolution of hydrogen gas on the copper wire surface? Dip the copper wire and put into contact with zinc metal. What is going on? Why does this reaction occur spontaneously? Write the net ionic equations for the reactions that occur on the surface of zinc and copper, point out oxidation and reduction processes. Observations: An adding Zn with. Hy sou, bubbles were fosuned, when copper wire was dipped Red Ox reactions: 16 so Galvanic cell scheme: Anode: Cathode: Conclusions:
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