Digs- Corrosion Prevention And Control Program Knowledge Evaluation

The factors that influence metal corrosion and the rate of corrosion include the presence of biological organisms and concentrations of electrolytes, the availability of oxygen, the time duration, the type of metal, and the temperature. All of these factors can contribute to the corrosion process and affect its rate.

ESD devices should be covered or packaged in ESD protective packaging when not being handled. This is because ESD (electrostatic discharge) can damage electronic components and devices. ESD protective packaging is designed to prevent the buildup and discharge of static electricity, protecting the devices from potential damage. Paper bags and plastic bags do not provide sufficient protection against ESD, and moisture-proof containers are not specifically designed to prevent ESD. Therefore, the correct option is D) ESD protective packaging.

The buildup of pollutants, dust, and debris can degrade ESD shielding by promoting corrosion and acting as insulators. Pollutants, dust, and debris can create a layer on the shielding material, which can lead to corrosion over time. This corrosion can weaken the shielding effectiveness of the material, making it less effective at preventing electrostatic discharge. Additionally, pollutants, dust, and debris can act as insulators, preventing the dissipation of static charges and allowing them to accumulate on the surface of the shielding material. This can also reduce the effectiveness of the ESD shielding.

Pitting corrosion refers to the formation of small pits or holes on the surface of a material. These pits are typically localized and can penetrate deep into the material, leading to structural damage. This type of corrosion is often caused by factors such as the presence of aggressive chemicals, uneven distribution of oxygen, or the formation of a protective film on the surface that traps corrosive agents. Therefore, option B, which states that pitting corrosion is characterized by tiny pits or holes in the surface, is the correct answer.

The correct answer is D) without causing additional damage to the structure. This is the most important factor to consider when removing corrosion products. While it may be desirable to remove the products within 24 hours, without the use of chemicals, or in a moisture-free environment, the priority is to ensure that the removal process does not cause any further harm to the structure. This is crucial in order to preserve the integrity and functionality of the affected area.

A comprehensive CPCP shall provide work centers with personnel who are trained in and dedicated to the prevention, early detection, reporting, and repair of corrosion damage. This means that the CPCP will ensure that there are trained individuals who are focused on preventing corrosion, detecting it early on, reporting any instances of corrosion, and repairing any damage caused by corrosion. This comprehensive approach helps to minimize the impact of corrosion and ensure that it is addressed promptly and effectively.

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 increase in the rate of corrosion.

Blue or blue-green accumulations are common corrosion by-products of copper alloys. When copper reacts with moisture and oxygen in the air, it forms a thin layer of copper oxide on its surface, which can appear blue or green in color. This is known as copper patina and is commonly seen on copper roofs, statues, and other copper objects that have been exposed to the elements for a long time. Therefore, the correct answer is B) Copper.

The correct answer is C)compatible. The sentence suggests that the removal method, tools, and equipment should be suitable or able to work effectively with the metal surface. The term "compatible" means that they can work together without causing any damage or negative effects.

The degree of microbial attacks on affected items is determined by both cleanliness, environment, and species of microorganism (A) as well as service life, size, shape, and surface smoothness (B).

Spraying is not an appropriate preservation application method if confined areas are involved because it can lead to overspray and the dispersal of the preservation material in areas where it is not intended to be applied. This can result in wastage of the preservation material and potential harm to the surrounding environment or objects. Therefore, other methods such as dipping, staining, or brushing would be more suitable for confined areas as they provide better control over the application and minimize the risk of overspray.

Filiform corrosion is a type of corrosion that appears as worm-like tracings beneath the paint film. It is typically caused by a localized breakdown of the protective coating, allowing moisture and corrosive substances to penetrate and create these characteristic worm-like patterns. This type of corrosion is commonly observed on metal surfaces, especially aluminum and its alloys, and can lead to significant damage if not addressed promptly.

Synthetic fiber clothes can generate static electricity, which can cause damage to ESD devices. Therefore, personnel should not wear synthetic fiber clothes when handling ESD devices to prevent any potential discharge of static electricity.

The correct answer is A) removal of the electrolyte and the application of protective coatings. This answer is correct because the presence of an electrolyte, such as moisture or a corrosive substance, is necessary for corrosion to occur. By removing the electrolyte, the conditions for corrosion are eliminated. Additionally, applying protective coatings, such as paint or corrosion-resistant materials, creates a barrier between the metal surface and the environment, preventing corrosion from taking place.

Galvanic corrosion occurs when two different metals are in contact with each other in the presence of an electrolyte, such as moisture or saltwater. In the case of ESD equipment, it is exposed to various field service environmental conditions, which may include moisture or other corrosive substances. This exposure can lead to the formation of galvanic corrosion on the equipment. Therefore, option A) Galvanic is the correct answer.

High daytime temperatures, high humidity, ultraviolet radiation, and fine dust are all characteristics of the desert environment. Deserts are known for their extreme heat, dryness, and lack of vegetation. The combination of these factors can be very destructive to both living organisms and structures. The high temperatures and humidity can cause dehydration and heat stroke in humans and animals, while the ultraviolet radiation can damage skin and eyes. The fine dust can also cause respiratory problems and damage to machinery. Overall, the desert environment poses significant challenges and risks due to these destructive elements.

Using litmus paper can sometimes help avoid or limit the use of indicating solutions. Litmus paper is a type of pH indicator that changes color when it comes into contact with an acidic or basic solution. By using litmus paper, one can quickly determine the pH of a substance without the need for additional solutions or reagents. This can be particularly useful in situations where indicating solutions may not be readily available or when a quick and simple test is needed.

Brushing is the most appropriate preservation application method for applying thick materials on small areas because it allows for precise control and coverage. Dipping may not be suitable for small areas as it involves immersing the entire object in the preservation material. Staining is typically used for adding color to wood rather than applying thick materials. Spraying may result in uneven coverage and is more suitable for larger areas.

White, powdery mounds or spots are common corrosion by-products of magnesium. Magnesium is a highly reactive metal and when it comes into contact with air or water, it undergoes oxidation, resulting in the formation of a white powdery substance. This substance is a corrosion by-product and is commonly seen on the surface of magnesium alloys.

The factors that influence the decision of which application method should be used are the application area, material viscosity, and application conditions. The application area refers to the specific surface or area where the material needs to 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. Different application methods may be better suited for materials with different viscosities. Lastly, application conditions refer to the environmental factors or constraints that may affect the application process, such as temperature, humidity, or accessibility. Considering these factors helps determine the most appropriate application method.

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

Staining is not a preservation application method because it is typically used to enhance the appearance of wood or other materials by adding color. Preservation application methods, on the other hand, are used to protect materials from decay, rot, or other forms of deterioration. Dipping, brushing, and spraying are all common methods used to apply preservatives to surfaces in order to prevent damage and extend their lifespan.

Battery electrolyte corrosion can occur in the battery, battery cover, battery box, and adjacent areas. The electrolyte in a battery is a corrosive substance, and if it leaks or spills, it can cause damage to the battery itself, as well as the surrounding components and surfaces. Therefore, it is important to regularly inspect and maintain these areas to prevent corrosion and ensure the proper functioning of the battery.

Lead acid and nickel-cadmium batteries are encountered on both aerospace and non-aerospace equipment. Lead acid batteries are commonly used in various applications including automobiles, uninterruptible power supplies, and backup power systems. Nickel-cadmium batteries are also widely used in both aerospace and non-aerospace equipment due to their high energy density, long cycle life, and ability to withstand extreme temperatures. Therefore, option B is the correct answer as it includes both types of batteries that are encountered on both types of equipment.

Material compatibility refers to the ability of different materials to interact with each other without causing corrosion or other forms of damage. 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 additional corrosion is not caused. Therefore, material compatibility is the correct answer.

The correct answer is D) mechanical compatibility. When selecting tools and equipment for the removal process, it is important to consider their mechanical compatibility. This means ensuring that the tools and equipment are suitable for the specific task at hand and will not cause any additional damage during the removal process. Using tools that are not mechanically compatible can lead to further damage to the materials or objects being removed, which is why it is crucial to make the right selection.

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 an acidic substance and it causes the bromothymol blue solution to undergo a pH change. The blue color of the solution is indicative of a basic or neutral pH. However, when phosphoric acid is added, it lowers the pH of the solution, causing it to turn into a more acidic environment. This change in pH leads to a color change from blue to gold or amber.