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Anode - ✔✔the electrode at which oxidation occurs.
electrons flow away from the the anode in the external circuit.
corrosion usually occurs and metal ions enter the solution at the anode
cathode - ✔✔the electrode at which reduction occurs. electrons flow towards the
cathode in the external ciruit
cathodic protection - ✔✔A technique to reduce the corrosion of a metal surface by
making that surface the cathode of an electrochemical cell.
corrosion - ✔✔the deterioration of a material, usually a metal, that results from a
reaction with its environment.
corrosion inhibitor - ✔✔A chemical substance or combination of substances that, when
present in the environment, prevents or reduces corrosion.
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,crevice corrosion - ✔✔localized corrosion of a metal surface at, or immediately adjacent
to, an area that is shielded from the environment and full exposure due to the close
proximity of the metal to another surface
electrolyte - ✔✔A chemical substance that promotes conduction of an electrical current
galvanic series - ✔✔List of metals and alloys arranged according to their corrosion
potentials in a given environment (in sea water at 25 celcius)
generalized corrosion - ✔✔Corrosion that is distributed more or less uniformly over the
surface of a material
localized corrosion - ✔✔Occurs at discrete sites and often in areas that are difficult to
inspect
mill scale - ✔✔The oxide layer formed during hot fabrication or heat treatment of
metals.
Passivation - ✔✔a layer of oxides formed on the surface of a metal that provides
corrosion protection (ex stainless steel)
a reduction of the anodic reaction rate of an electrode involved in corrosion,
Pitting Corrosion - ✔✔Localized corrosion of a metal surface that is confined to a small
area and takes the form of cavities called pits.
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,Return Path (Metallic Pathway) - ✔✔Connects the anode and cathode, allowing passage
of electrons, generated at the anode, to the cathode
what are the elements of a corrosion cell - ✔✔1. Anode 2. Cathode 3. Metallic pathway
4. Electrolyte
what happens at anode - ✔✔oxidation. metal dissolves into electrolyte
what is the function of the electrolyte - ✔✔Allows the passage of ions to connect the
corrosion cell
what is the function of the metallic pathway - ✔✔Allows the flow of electrons to
connect the corrosion cell
The general rules of galvanic corrosion are: - ✔✔The less noble (or more reactive) metal
when connected to a more noble (or less reactive metal) will corrode preferentially
name at least 5 factors that affect the rate of corrosion - ✔✔temp, humidity, chemical
salts, oxygen, pollutants
General Corrosion - ✔✔Uniform loss of material over an entire surface and general
thinning of affected surface
corrosion that is distributed more or less uniformly
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, does not cause catastrophic failures
Localized Corrosion - ✔✔Occurs at discrete sites and often in areas that are difficult to
inspect.
concentrated and can cause catastrophic failures
what are some of the common tools/methods used for corrosion control - ✔✔inhibitors,
design, cathodic protection, protective coatings, splash zone systems, altering the
environment
Coatings Specification - ✔✔Formal, structured document containing information on a
project (scope, terms, schedule, inspection, etc.)
Instrument Calibration History Reports - ✔✔Reports that normally contain information
on how frequently each instrument is to be or has been calibrated.
Materials Inventory Reports - ✔✔Reports that contain information on the inventory of
jobsite materials, and are normally submitted periodically
safety data sheets (SDS sheets) - ✔✔a form containing data of known substances in a
particular product
Quality insurance (QA) - ✔✔any systematic process that checks whether a
manufactured product or service being developed is meeting specified requirements
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