Corrosion quiz answer key.pdf

Answer Key Name: __________________________________ Corrosion control Quiz Date: _________________ Fretting 1) Rivet "smoking" is an indication of what type of corrosion?...

Answer Key Name: __________________________________ Corrosion control Quiz Date: _________________ Fretting 1) Rivet "smoking" is an indication of what type of corrosion? __________________________________ Wash Primer 2) Filiform corrosion is usually caused by an improperly cured ___________________________ _______________________ Magnesium 3) ________________________ is particularly vulnerable to corrosive attack from salt solutions. 4) The four basic requirements for the formation of corrosion in a material are: Presence of a metal that will corrode (anode) a. _____________________________________________________________________________ presence of a dissimilar conductive metal (cathode) which has less tendency to corode b. _____________________________________________________________________________ Presence of a conductive liquid electrolyte c. _____________________________________________________________________________ Electrical contact between the anode and cathode (usually metal to metal contact) d. _____________________________________________________________________________ anode 5) In an electrochemical reaction, it is the _________________ (anode or cathode) which will be eaten away. 6) The basic unit of a chemical element is the atom. It is made up of a nucleus which contains _____________ protons _________________ neutrons and _______________and electrons is surrounded by spinning ___________________ 7) What electrical charge is carried by each of these atomic particles? positive a. Proton ____________________b. no charge Neutron ______________ negative c. Electron __________________ intergranular corrosion. 8) Corrosion that forms along the grain boundaries within an aluminum alloy is called ______________ chemical 9) What are the two general classifications of corrosion _____________________ electro-chemical and ___________________________ Aluminum oxide________________ film on its 10) Aluminum alloy are protected from oxidation by the formation of a(n) _______________ surface. quenching 11) Intergranular corrosion of aluminum alloys is usually caused by delaying the _________________ during heat treatment. shot-peen 12) What form of metal treatment is used to help prevent stress corrosion? __________________ ______________________ tensile 13) Stress corrosion may occur when the metal is subjected to _____________________ stress in the presence of a corrosive environment negative 14) If an atom has more electrons than protons, it is called a ___________________ ion. varsol kerosene 15) Stubborn exhaust stains may be removed with a 1 :2 mixture of ____________________ and ______________ hydrogen 16) Use of non-recommended cleaning compounds can result in a condition known as ______________ embrittlement ___________________ aliphatic 17) The two most common types of naphtha are ________________________ aromatic _______________________ 18) When a metal such as aluminum is exposed to a containing oxygen the chemical reaction forms what type of corrosion. oxidation ________________________________ open 19) Metallic ion concentration cell corrosion forms in _______________________ (open or closed) areas 20) Where two dissimilar metals are joined in a structure, and corrosion forms on one of them, it is usually a form of galvanic ________________________________ corrosion.