Answer the following Il mark each a. Identify the ope of corrosion that will hap

Question

Answer the following Il mark each a. Identify the ope of corrosion that will happen in this situation i. Atmospheric i Galvanic ii Pitting iv Crevice b. Identify the type of corrosion that will happen in this sit 1. Atmospheric ii Galvanic in Pitting iv Crevice 2. Define surface film corrosion cell and identify one situation where it could occur 13 marks) 3. Briefly explain what is "pillowing" phenomenon, why it occurs and identify what kind of corrosion form and corrosion cell applies for this situation. 15 marks Instructor: Dr. Ragu Kannan Section-103

Explanation / Answer

A- Atmospheric corrosion

B- Galvanic corrosion

2-The surface of a metallic object can be easily reacted in normal atmospheres making it behave quite differently from a piece of unreacted metal, a situation closely related to dissimilar metal corrosion. A film may be formed which is invisible, actually only a few molecules in thickness. A  common occurrence of surface film cell is found in older distribution piping systems where a section of pipe has been replaced because of corrosion damage.

3- The corrosion induced distortion of aircraft skins commonly referred to as pillowing which involves plastic deformation and in extreme cases cracking in lap joints. During operation of aircraft adhesive layer can deteriorate and disbond allowing moisture to migrate in skin which leads to cervice corrosion. Differential aeration corrosion cells form in cervice corrosion.

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