Corrosion & NDT Questions and Answers 2024/2025

Chemical Corrosion  result of direct exposure of unprotected surface to a corrosive liquid or gas Metals more susceptible to corrosion are _____ and less susceptible are _____  anodic, cathodic 4 things required for metals to corrode  1) A metal that will corrode (anode) 2) A dissimilar metal with less tendency to corrode (cathode) 3) Conductive pathway 4) Electrolyte Most anodic will give up electrons _____  most easily What element is at the top of the nobility chart?  Mg What are the 12 types of corrosion?  1) Uniform surface corrosion 2) Pitting 3) Intergranular 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel! 1 | P a g e | G r a d e A + | 2 0 24 / 2 0 2 5 4) Exfoliation 5) Oxidization 6) Galvanic 7) Concentration cell 8) Stress 9) Fretting 10) Filiform 11) Microbiological 12) Fatigue Untreated uniform surface corrosion is indicated by _____  clumps of white powder Oxidization is also called  dry corrosion Galvanic corrosion is also known as  disimilar metal corrosion Filiform corrosion is normally caused by _____  water under the paint Smoking rivets are an example of _____ 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel! 1 | P a g e | G r a d e A + | 2 0 24 / 2 0 2 5  fretting corrosion Fatigue corrosion is caused by _____  cyclic stress 7 Examples of corrosive agents  1) Acids and alkalis 2) Mercury 3) Liquids 4) Paint stripper