QUESTIONS AND MODEL RESPONSES
◉ What is Passivation? Answer: A layer of oxides formed on the
surface of a metal that provides corrosion protection.
◉ What is an example of passivation? Answer: Stainless Steel
◉ What are the elements of a corrosion cell? Answer: Anode,
Cathode, Metallic Pathway, Electrolyte
◉ Describe what happens at the anode. Answer: The metal dissolves
into the electrolyte
◉ What is the function of the electrolyte? Answer: Allows the
passage of ions to connect the corrosion cell
◉ What is the function of the metallic pathway? Answer: Allows the
flow of electrons to connect the corrosion cell
◉ What is the galvanic series? Answer: A listing of metals in order of
reactivity (more or less noble) in seawater at 25 C
,◉ The general rules of galvanic corrosion are: Answer: The more
reactive metal --when connected to the less reactive (more noble)
metal -- will corrode preferentially
◉ Name the five (5) most important factors that affect the *rate of
corrosion.* Answer: Humidity, oxygen, chemical salts, pollutants,
temperature
◉ General corrosion is: Answer: Results in a relatively *uniform*
loss of material over the entire surface, Results in a general thinning
of the affected surface, Relatively easy to inspect, Does not casue
catastrophic failures
◉ Localized corrosion is: Answer: At discrete/specific spots on the
metal surface. Typically pitting and crevice corrosion. The most
concerning as damage is concentrated and loss of integrity or
structural failure can result.
◉ List some of the common tools/methods used for *corrosion
control*. Answer: Design, Inhibitors, Material Selection, Cathodic
Protection, Protective Coatings, Splash Zone Systems, Alteration of
the Environment
◉ How does NACE define the Inspector's role? Answer: The
inspector's role is that of a *quality control technician* responsible
, for *observing and reporting conformance or deviation from the
project specification.*
◉ What is the inspector's responsibility when it comes to safety on
the project? Answer: Safety enforcement is not the responsibility of
the inspector; however, it is his/her responsibility to report any
issues that may affect the project.
◉ Name some tests that may need to be conducted during surface
preparation and coating operations. Answer: Ambient Temperature,
Relative Humidity & Dew Point, Anchor Profile, Surface Cleanliness
◉ Name some of the documentation/reports that may be required
to be maintained on a coatings project. Answer: Daily/weekly
summary, material usage reports, manpower and equipment,
conformance, and Non-conformance
◉ What are the most important characteristics of a good report?
Answer: Objective, Accurate, and Detailed.
◉ What is the inspector's primary responsibility and what should
the inspector not do as it pertains to the specification. Answer: The
Inspector's primary responsibility as the inspector is to "enforce"
specification. The inspector is *NOT* to make changes to the
specification for any reason.