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Experment.1

Principles of corrosion. Experment.1. Determination the Corrosion rate of Aluminum in basic media Sodium hydroxide(1M) by 1- Weight-loss Technique 2- Gasometric Technique . Theory:. Study the Corrosion of metals could be determined by two methods: 1- the chemical study that includes

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Experment.1

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  1. Principles of corrosion Experment.1 Determination the Corrosion rate of Aluminum in basic media Sodium hydroxide(1M) by1- Weight-loss Technique2- Gasometric Technique Principles of corrosion By: Enam.M.Ayob

  2. Theory: Study theCorrosion of metals could be determined by two methods: 1- the chemical study that includes • Mass loss measurement • Gasometry measurement Principles of corrosion By: Enam.M.Ayob

  3. 2- Electrochemical study that includes: • Polarization measurement curves. • The Electrochemical Impedance Spectroscopy (EIS). Principles of corrosion By: Enam.M.Ayob

  4. Determination of The corrosion Rate (CR) of metals by the weight loss is direct and simple but unfortunately, requires longer time compared to other methods. Principles of corrosion By: Enam.M.Ayob

  5. Dissolution of Al in NaOHsolution is accompanied by evolution of hydrogen gas(Gasometric Technique) according to the equation: 2H+ + 2e H2 Principles of corrosion By: Enam.M.Ayob

  6. Equipment and chemicals Equipment: • Mellus cell • Burette & stand • Beaker 1000 ml • Graduated cylinder • Stop watch • Aluminum sample • different grade emery papers (120,150, 220, 400) • Rubber tube Chemicals: NaOH (1M) , Ethanol or Acetone Principles of corrosion By: Enam.M.Ayob

  7. Procedures: • Clean Mellus cell by tap water then by distilled water. • But 50 ml ofNaOH (1M)inMellus cell then fix it by stand. • Connect the Mellus cell with burette by Rubber tube to collect gas as showed in Fig 1 Principles of corrosion By: Enam.M.Ayob

  8. Fig. 1. Principles of corrosion By: Enam.M.Ayob

  9. Polish Aluminum sample with different grade emery papers (120,150, 220, 400), then wash by distilled water and ethanol, finally dry it by dryer. • Weight Aluminum sample then dope it in the Mellus cell W1. • Determine the area of Aluminum sample from followed equation: A = 2rL + 2r2 L = length r=diameter • Put the sample in cell, cover it and turn on the stop watch immediately. Principles of corrosion By: Enam.M.Ayob

  10. Determine the volume of O2 evolution every 3minuts as showed in followed table: Principles of corrosion By: Enam.M.Ayob

  11. Calculate the Corrosion rate of Aluminum by Gasometry measurement Principles of corrosion By: Enam.M.Ayob

  12. After 60 minutes, spell the solution then wash the sample by distilled water and ethanol, dry it by dryer finally Wight it (W2) . • Determine the final time (tf). • Calculate the Corrosion rate of Aluminum by Mass loss method from followed equation: Principles of corrosion By: Enam.M.Ayob

  13. Experment.2 Determination the Corrosion rate of Aluminum in Sodium hydroxide in presence of inhibitor(pomegranate peel)by1- Weight-loss Technique2- Gasometric Technique Principles of corrosion By: Enam.M.Ayob

  14. Experment.2 Determination the Corrosion rate of Aluminum in Sodium hydroxide (0.5M)by1- Weight-loss Technique2- Gasometric Technique Principles of corrosion By: Enam.M.Ayob

  15. Experment.3 Determination the Corrosion rate of Aluminum in Sodium hydroxide in presence of inhibitor(pomegranate peel) by1- Weight-loss Technique2- GasometricTechnique Principles of corrosion By: Enam.M.Ayob

  16. Experment.4 Determination the Corrosion rate of Aluminum in Sodium hydroxide in presence of inhibitor(Orange peel)by 1- Weight-loss Technique2- GasometricTechnique Principles of corrosion By: Enam.M.Ayob

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