Question

Describe how Aluminium can corrode or degradein Aircraft Fuselage.

And methods for avoid degradation in Aircraft Fuselage.

Answer 1

Answer:-

              Aluminium can corrode or degradein Aircraft Fuselage because aluminium metal alone has a very low corrosion resistance thermodynamically due to its low position in the galvanic series, which is the series representing standard reduction potentials of various metal and non-metals ions relative to the hydrogen ion. A lower position in this series makes a metal more likely to react in the redox reactions as the anode , loosing mass and corroding .  

                Methods to avoid degradation or corrosion:-

              1. Surface Coverings:-     Due to the operating nature of an aircraft , it is an constant exposure to corrosive environment. Corrosion is a major cause of metallic structural life reduction as it can enhance fatigue crack growth especially in aircraft joints. A typical coating can be given to aircraft body which is composed of polyurethane and polyester , it will work as a corrosion resistance.

             2. Surface cleaning and drying:-   There are five crusial steps for corrosion removal

                                                               (a) Cleaning and stripping of the corroded area

                                                               (b) Removing as much of the corrosion products as practicable.

                                                               (c) Neutralizing any residual materials remaining in pits and crevices.

                                                               (d) Restoring surface protective films.

                                                               (e) Applying temporary or permanent coatings or paint finishes

              3. Anodizing:- Anodizing refers to the process of electrolysis where which thickness oxide film that forms naturally outside of metals , thus creating another layer of protection for the metal from corrosion due to natural elements and process.

                                 Other processes are Electrolytic process of aluminium anodizing   etc.