Afjqsxxxxx-201c Corrosion Prevention And Control Knowledge Evaluation

The factors that influence metal corrosion and the rate of corrosion are biological organisms and concentrations of electrolytes, availability of oxygen and time, and the type of metal and temperature. Biological organisms and electrolyte concentrations can accelerate corrosion by providing a conducive environment for chemical reactions. The availability of oxygen is necessary for the oxidation process that causes corrosion, and the duration of exposure to these factors determines the rate of corrosion. Additionally, different metals have varying susceptibility to corrosion, and higher temperatures can accelerate the corrosion process. Therefore, all of these factors contribute to metal corrosion and its rate.

ESD (Electrostatic Discharge) devices are sensitive to static electricity and can be damaged if not handled properly. Therefore, when not being handled, it is important to cover or package them in ESD protective packaging. This packaging is specifically designed to prevent the buildup and discharge of static electricity, ensuring the safety and integrity of the ESD devices. Using paper bags or plastic bags may not provide sufficient protection against static electricity, while moisture-proof containers may not address the specific needs of ESD devices.

A comprehensive Corrosion and Control Program (CPCP) aims to prevent corrosion damage by implementing measures to stop it from occurring in the first place. This includes taking preventive actions such as regular cleaning and maintenance to minimize the risk of corrosion. Additionally, the program emphasizes early detection of any signs of corrosion, which allows for prompt reporting and immediate action to mitigate further damage. Finally, the CPCP emphasizes the importance of repair, ensuring that any corrosion damage is addressed and fixed in a timely manner to prevent further deterioration.

Pitting corrosion is a type of corrosion that results in the formation of small pits or holes on the surface of a material. This occurs when localized areas on the surface become more chemically active and corrode at a faster rate compared to the surrounding areas. These pits or holes can weaken the material and lead to further degradation if left untreated.

When removing corrosion products, it is crucial to ensure that no further harm is caused to the structure. This means that the removal process should be done carefully and without causing any additional damage. The other options mentioned, such as removing the corrosion within 24 hours or without chemical methods, may be important considerations but they are not as critical as avoiding any further damage to the structure. Similarly, performing the removal in a moisture-free environment may be beneficial, but it is not as essential as preventing additional harm to the structure.

The correct answer is "compatible". When selecting a removal method, tools, and equipment for a metal surface, it is crucial that they are compatible. This means that they should work well together and not cause any damage or adverse effects to the metal surface. Using incompatible methods, tools, or equipment may result in scratches, corrosion, or other forms of damage to the metal. Therefore, compatibility is essential to ensure the proper and safe removal of materials from the metal surface.

When dirt, salt, acidic stack gases, and engine exhaust gases dissolve on wet surfaces, they increase the electrical conductivity of the electrolyte. This increased conductivity leads to an increased rate of corrosion.

Blue or blue-green accumulations are common corrosion by-products of copper alloy. Copper is prone to corrosion, especially in the presence of moisture and oxygen. When copper corrodes, it forms a blue or blue-green patina on its surface. This patina is a result of the reaction between copper and the surrounding environment, forming copper oxide and copper carbonate. These corrosion by-products not only give copper its characteristic color but also act as a protective layer, preventing further corrosion of the metal. Therefore, the presence of blue or blue-green accumulations is a clear indication of copper corrosion.

The buildup of pollutants, dust, and debris can degrade ESD shielding by promoting corrosion and acting as insulators. Pollutants, dust, and debris can cause corrosion on the ESD shielding material, which weakens its ability to conduct electricity effectively. Additionally, these particles can act as insulators, preventing the proper flow of electricity and reducing the effectiveness of the ESD shielding. Therefore, both options A and B are correct.

The degree of microbial attacks on affected items is determined by both cleanliness, environment, and species of microorganism as well as service life, size, shape, and surface smoothness. Cleanliness and the specific environment play a role in creating conditions that are either favorable or unfavorable for microbial growth. Additionally, the characteristics of the affected items such as service life, size, shape, and surface smoothness can also impact the degree of microbial attacks. Therefore, both factors A (cleanliness, environment, and species of microorganism) and B (service life, size, shape, and surface smoothness) contribute to determining the degree of microbial attacks.

Spraying is not an appropriate preservation application method if confined areas are involved because it can lead to the accumulation of excessive amounts of the preservation substance in a small space. This can result in an uneven distribution of the substance and potential damage to the confined area. Dipping, staining, and brushing are more suitable methods as they allow for better control and precision when applying the preservation substance in confined areas.

Galvanic corrosion occurs when two dissimilar metals come into contact in the presence of an electrolyte, such as moisture or saltwater. In the case of Electrostatic Discharge (ESD) equipment, exposure to various field service environmental conditions can lead to the formation of galvanic corrosion. This corrosion can occur when different metals or alloys are used in the construction of the equipment, creating a galvanic cell and causing the more reactive metal to corrode.

When handling ESD devices, personnel should not wear synthetic fiber clothes because synthetic fibers can generate static electricity, increasing the risk of electrostatic discharge. Cotton clothes, on the other hand, do not generate static electricity and are therefore a safer option. Wearing rubber smocks over clothing can help to dissipate static electricity, making it a suitable choice. However, synthetic fiber clothes should be avoided to minimize the chances of damaging ESD devices.

Filiform corrosion is a type of corrosion that appears as worm-like tracings beneath the paint film. It occurs when a coating or paint film on a metal surface is breached, allowing moisture to penetrate. The moisture then reacts with the metal, causing the formation of filaments or worm-like corrosion patterns. This type of corrosion is commonly seen on painted metal surfaces, especially in humid environments. It can lead to paint delamination and ultimately, the degradation of the metal substrate.

Battery electrolyte corrosion can occur in the battery, battery cover, battery box, and adjacent areas. The electrolyte in a battery is a corrosive substance that can leak or spill, leading to corrosion of the battery components such as the battery cover and battery box. Additionally, the adjacent areas around the battery can also be subject to corrosion if the electrolyte comes into contact with them. Therefore, it is important to handle batteries carefully and ensure that any spills or leaks are cleaned up promptly to prevent corrosion in these areas.

The two most important factors in preventing corrosion are the removal of the electrolyte and the application of protective coatings. Corrosion occurs when metal is exposed to an electrolyte, such as water or moisture, which facilitates the flow of electric current. By removing the electrolyte, the conditions for corrosion are greatly reduced. Additionally, applying protective coatings, such as paint or corrosion-resistant coatings, creates a barrier between the metal and the environment, further preventing corrosion from occurring.

Staining is not a preservation application method because it is a process of adding color or tint to a surface, usually for decorative purposes, rather than protecting or preserving it. Dipping, brushing, and spraying, on the other hand, are all methods commonly used for applying preservatives to surfaces to prevent decay, rot, or damage.

The decision of which application method should be used is influenced by the application area, material viscosity, and application conditions. The application area refers to the specific surface or object where the material will be applied. Different application methods may be more suitable for different areas. Material viscosity refers to the thickness or consistency of the material being applied. Some application methods may work better for thin or thick materials. Lastly, application conditions such as temperature, humidity, and environmental factors can also impact the choice of application method.

White, powdery mounds or spots are common corrosion by-products of magnesium. Magnesium is a highly reactive metal that easily reacts with oxygen and moisture in the air, forming a white powdery substance known as magnesium oxide. This corrosion process occurs when the surface of magnesium is exposed to the elements, leading to the formation of these characteristic white mounds or spots.

Brushing is the most appropriate prevention application method for applying thick materials on small areas because it allows for precise control and coverage. With a brush, the thick material can be evenly distributed and applied in a controlled manner, ensuring that it reaches all the necessary areas. This method is particularly effective for small areas where accuracy and attention to detail are important. Dipping, staining, and spraying may not provide the same level of precision and control as brushing, making them less suitable for applying thick materials on small areas.

Litmus paper is commonly used in laboratories to test the acidity or alkalinity of a solution. It changes color in the presence of an acid or a base, indicating whether the solution is acidic or alkaline. By using litmus paper test strips, one can quickly determine the nature of a solution without the need for additional chemicals or complex procedures. This can help avoid the use of other indicating solutions and limit the scope of testing to a simple and efficient method.

There are two types of chemical solutions used for corrosion removal from titanium and titanium based alloys.

The given statement mentions high daytime temperatures, high humidity, ultraviolet radiation, and fine dust as the most serious and destructive elements of the environment. These conditions are commonly associated with desert environments, where the temperature can be extremely high, humidity levels are low, ultraviolet radiation is intense due to the lack of cloud cover, and fine dust particles are prevalent in the arid regions. Therefore, the correct answer is "desert".

Material compatibility refers to the ability of different materials to interact with each other without causing corrosion or other adverse effects. In the context of the question, using a medium for brushing, abrading, blasting, etc. that is compatible with the material being worked on would ensure that no additional corrosion is caused. Therefore, material compatibility is the correct answer.

The correct answer is lead-acid and nickel-cadmium. Lead-acid batteries are commonly used in aerospace and non-aerospace equipment due to their reliability and ability to provide high current. Nickel-cadmium batteries are also encountered in these applications as they have a high energy density and long cycle life.

When removing something, it is important to select tools and equipment that are mechanically compatible. This means that they should be able to work together effectively without causing any additional damage. Using tools and equipment that are not mechanically compatible can result in further damage during the removal process. Therefore, mechanical compatibility is crucial in preventing additional damage.

When phosphoric acid is added to bromothymol blue indicating solution, the color will turn from blue to gold or amber. This is because phosphoric acid is acidic and causes the bromothymol blue to undergo a color change. The blue color of the indicating solution is due to its basic nature, but when an acid like phosphoric acid is added, it neutralizes the basicity and causes the solution to turn into a gold or amber color.