for the two limiting cases of the model 4.3. Mathematical Model for Pit Initiation during the Early Stages of Etching 4.3.1. Model Equations 4.3.2. Effect of various parameters on the etching behavior of aluminum 4.3.2.1. Effect of sodium hydroxide pretreatment time 4.3.2.2. Effect of the applied current density 4.3.2.3. Effect of the temperature of the etchant solution 4.3.2.4. Effect of open circuit immersion time in the etchant 4.3.2.5. Effect of the chloride ion concentration 4.3.2.6. Effect of stirring the etching solution 5. CONCLUSION 84