Engineers and technicians working in companies that work with metals will certainly have a corrosion problem ahead of their lives. THIS IS A FACT! So I recommend a careful reading of this post which I believe will be very useful. This information is easy to understand, but very relevant and can help to understand a little of this phenomenon and solve problems in this very important area. GOOD READING!

1. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
Aloysio de Aguiar
Managing Director at Sciencetec & Corrtec Engineering UNICAMP -
Universidade Estadual de Campinas
Campinas, São Paulo, Brazil

2. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:

3. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
44 -- WhatWhat cancan bebe donedone toto preventprevent itsits attack,attack, howhow toto combat,combat, controlcontrol oror preventprevent metalmetal corrosion?corrosion?
AsAs aa naturalnatural processprocess itit willwill occur.occur. WhatWhat engineersengineers andand technicianstechnicians workingworking inin thethe areaarea mustmust dodo isis findfind thethe
bestbest mediummedium and solutionand solution forfor corrosioncorrosion does not occurdoes not occur beforebefore the end of thethe end of the lifelife of the products andof the products and
equipmentequipment..
55 -- WhatWhat areare thesethese waysways ofof combating,combating, controllingcontrolling andand preventingpreventingcorrosion?corrosion?
ThereThere areare manymany waysways toto preventprevent corrosion fromcorrosion from occurringoccurring undesirably.undesirably. The firstThe first thingthing that mustthat must be done is anbe done is an
analysisanalysis of the soof the so--calledcalled "ROOT"ROOT CAUSE",CAUSE", thatthat isis toto investigateinvestigate deeply because thedeeply because the unexpected corrosionunexpected corrosion
occurred.occurred. ThereThere isis alwaysalways anan answer,answer, aa predominant factorpredominant factor or someor some factorsfactors actingacting together.together. Then findThen find out theout theoccurred.occurred. ThereThere isis alwaysalways anan answer,answer, aa predominant factorpredominant factor or someor some factorsfactors actingacting together.together. Then findThen find out theout the
root cause(s), findroot cause(s), find thethe bestbest solution.solution.
TheThe greatgreat "" FREQUENTFREQUENT ANDAND AGGRESSIVEAGGRESSIVE "" areare waterwater in liquidin liquid formform or asor as moisturemoisture in thein the air,air, oxygen,oxygen,
aggressive agents,aggressive agents, dust,dust, tec.tec. Among thoseAmong those available,available, ifif corrosioncorrosion is occurring during the processis occurring during the process we canwe can
mention protection with protectivemention protection with protective oils oroils or temporary corrosiontemporary corrosion inhibitors, packaginginhibitors, packaging with volatilewith volatile inhibitorsinhibitors
typetype VCIVCI oror eliminateeliminate thethe source (s)source (s) of corrosion.of corrosion.
IIff corrosion occurs in the finished product, in additioncorrosion occurs in the finished product, in addition toto the solutionsthe solutions mentioned abovementioned above it is necessaryit is necessary toto
investigateinvestigate whetherwhether thethe protectionprotection used is theused is the most appropriatemost appropriate or if it is theor if it is the casecase of usingof using metallic protectivemetallic protective
coatingscoatings or paint,or paint, more resistant materials,more resistant materials, suitablesuitable corrosion resistant packaging.corrosion resistant packaging. These solutions areThese solutions are effectiveeffective
and usuallyand usually solve,solve, but there arebut there are manymany othersothers specific tospecific to eacheachcase.case.

4. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
66 -- DoesDoes itit meanmean thatthat corrosioncorrosion cannotcannot bebe eliminatedeliminated??
UnfortunatelyUnfortunately thethe answeranswer isis ""AA BIGBIG NO!NO!"" ButBut dodo notnot despair,despair, whatwhat wewe callcall aa solutionsolution isis CORROSIONCORROSION CONTROL,CONTROL, oror
findfind thethe bestbest andand mostmost economicaleconomical meansmeans toto ensureensure thatthat itit doesdoes notnot occuroccur atat anan undesiredundesired moment,moment, ie,ie, thethe
productproduct doesdoes notnot presentpresent aa corrosivecorrosive attackattack beforebefore arrivingarriving atat thethe nextnext operation,operation, ifif inin process,process, oror toto thethe endend
customercustomer andand duringduring itsits projectedprojected lifelife..
THISTHIS ISIS THETHE ONLYONLY SOLUTION!SOLUTION! SOSO REMEMBERREMEMBER::
CORROSION CANNOT BE ELIMINATED BUTCORROSION CANNOT BE ELIMINATED BUT CONTROLLED!CONTROLLED!
77-- AreAre allall metalsmetals susceptiblesusceptible toto corrosioncorrosion??
AgainAgain,, thethe answeranswer isis ""UNFURTUNATELYUNFURTUNATELY YESYES!!"" AllAll metalsmetals willwill exhibitexhibit corrosivecorrosive attackattack thatthat cancan taketake hourshours oror years,years,
dependingdepending onon thethe metal'smetal's ownown resistanceresistance andand thethe protectionprotection thatthat waswas applied,applied, asas wewe mentionedmentioned above,above,
understandunderstand thatthat itit isis aa naturalnatural andand irreversibleirreversible processprocess..
MetalsMetals havehave differentdifferent behaviorsbehaviors withwith respectrespect toto theirtheir resistanceresistance toto thethe mediummedium inin whichwhich theythey areare exposedexposed.. ThereThere
areare hundredshundreds ofof metallicmetallic materialsmaterials andand therethere isis aa lotlot ofof informationinformation inin thethe literatureliterature aboutabout thethe bestbest material,material,
surfacesurface treatment,treatment, packaging,packaging, etcetc..,, dependingdepending onon thethe weather,weather, thethe environmentenvironment itit mustmust withstand,withstand, aggressiveaggressive
agentsagents thatthat maymay bebe present,present, etcetc..
EvenEven stainlessstainless steelssteels cancan suffersuffer aa corrosivecorrosive attackattack dependingdepending onon whetherwhether thethe specificationspecification waswas incorrectincorrect oror ifif
somethingsomething undesirableundesirable toto useuse -- RememberRemember therethere areare hundredshundreds ofof differentdifferent stainlessstainless steels,steels, eacheach oneone indicatedindicated forfor
eacheachsituationsituation..

5. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
88 -- OnceOnce thethe attackattack hashas occurredoccurred areare therethere solutionssolutions forfor reusereuse ofof thethe product(sproduct(s)?)?
THE ASWER IS:THE ASWER IS: DEPENDDEPEND ON CASEON CASE BYBY CASECASE!!
IfIf corrosioncorrosion isis identifiedidentified duringduring thethe processprocess andand thethe productproduct isis stillstill goinggoing throughthrough otherother operationsoperations oror reworkrework
thatthat cancan removeremove corrosion,corrosion, suchsuch asas machiningmachining thethe deteriorateddeteriorated regionregion removesremoves thethe areaarea underunder attackattack oror ifif
thethe materialmaterial goesgoes throughthrough chemicalchemical processesprocesses suchsuch asas pickling,pickling, chemicalchemical treatmentstreatments oror electrochemicalselectrochemicals thatthat
removeremove corrosioncorrosion priorprior toto thethe applicationapplication ofof thethe appropriateappropriate treatment,treatment, thenthen itit isis possiblepossible toto recoverrecover andand
useuse thethe productsproducts..
TheThe identificationidentification isis foundfound onon thethe finishedfinished productproduct (s)(s) andand theythey willwill notnot gogo throughthrough otherother operationsoperations onon thetheTheThe identificationidentification isis foundfound onon thethe finishedfinished productproduct (s)(s) andand theythey willwill notnot gogo throughthrough otherother operationsoperations onon thethe
customercustomer thatthat resultresult inin thethe removal,removal, asas describeddescribed above,above, thethe answeranswer isis NO!NO! AsAs alreadyalready stated,stated, corrosioncorrosion isis anan
irrevocableirrevocable process,process, withwith nono meansmeans ofof causingcausing oxidesoxides andand otherother corrosioncorrosion productsproducts toto returnreturn toto beingbeing thethe
samesame mmineralineral againagain!!
99 -- IsIs therethere anyany specialspecial techniquetechnique toto preventprevent corrosioncorrosion fromfrom occurringoccurring??
NNOW THE ASWER IS: YOW THE ASWER IS: YESES!!
ThereThere areare solutionssolutions calledcalled cathodiccathodic protectionprotection thatthat throughthrough currentcurrent rectifyingrectifying equipmentequipment oror sacrificialsacrificial anodesanodes
preventprevent thethe processprocess fromfrom occurringoccurring byby constantlyconstantly sendingsending printedprinted currentcurrent wherewhere itit isis desireddesired toto protectprotect..
ButBut thesethese solutionssolutions areare expensive,expensive, requirerequire complexcomplex installations,installations, constantconstant maintenancemaintenance andand areare onlyonly
indicatedindicated andand usedused inin veryvery specialspecial casescases wherewhere corrosioncorrosion ifif itit occursoccurs cancan causecause damagesdamages toto equipmentequipment andand
peoplepeople withwith incalculableincalculable damagesdamages andand consequencesconsequences.. ExamplesExamples includeinclude towerstowers forfor thethe transmissiontransmission ofof
electricityelectricity oror telecommunications,telecommunications, metersmeters andand trains,trains, oiloil rigs,rigs, largelarge vessels,vessels, pipelines,pipelines, etcetc.. ThisThis isis thethe onlyonly wayway
toto preventprevent corrosioncorrosion fromfrom occurring,occurring, butbut unfortunatelyunfortunatelyitit doesdoes notnot applyapply inin mostmost industryindustry casescases..

6. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
1010 -- Finally,Finally, corrosioncorrosion mustmust bebe understoodunderstood asas aa naturalnatural processprocess andand therethere
areare manymany waysways ofof controllingcontrolling it,it, butbut forfor thisthis itit isis imperativeimperative toto
understandunderstand thethe processprocess thatthat resultedresulted inin thethe attackattack soso thatthat thethe bestbest
solutionsolution isis usedused..
SoSo farfar wewe onlyonly citecite corrosioncorrosion asas evil,evil, butbut therethere areare hundredshundreds ofof
applicationsapplications thatthat withoutwithout corrosioncorrosion wouldwould bebe veryvery difficultdifficult oror eveneven
impossibleimpossible..impossibleimpossible..
AmongstAmongst somesome wewe cancan mentionmention thethe batteriesbatteries ofof vehicles,vehicles, cellcell phones,phones,
watcheswatches andand eveneven spacespace traveltravel dependdepend onon corrosion,corrosion, soso whatwhat wewe
shouldshould dodo isis useuse ourour knowledgeknowledge toto controlcontrol itit whenwhen necessarynecessary andand taketake
advantageadvantage ofof itsits manymany benefitsbenefits..
AA specific material on these advantages that the corrosion is properlyspecific material on these advantages that the corrosion is properly
understoodunderstood andand ccan be found atan be found at the linkthe link::
https://https://www.slideshare.net/AloysioAguiar/mythswww.slideshare.net/AloysioAguiar/myths--andand--truthstruths--ofof--thethe--
corrosioncorrosion--phenomenonphenomenon

7. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
WEWE HOPEHOPE THATTHAT THISTHIS INFORMATIONINFORMATION WILLWILL
BEBE USEFULUSEFUL FORFOR YOU!YOU!
HAVINGHAVING ANYANY SPECIALSPECIAL REQUESTSREQUESTS THATTHAT HAVEHAVEHAVINGHAVING ANYANY SPECIALSPECIAL REQUESTSREQUESTS THATTHAT HAVEHAVE
NOTNOT BEENBEEN TREATEDTREATED HEREHERE WEWE WILLWILL HAVEHAVE THETHE
PLEASUREPLEASURE TOTO HELPHELP YOUYOU -- JUSTJUST LETLET USUS KNOW!KNOW!

8. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:

9. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:

10. 10 MANDATORY AND USEFUL10 MANDATORY AND USEFUL CORROSIONCORROSION INFORMATIONINFORMATION THAT ALL THE ENGINEERSTHAT ALL THE ENGINEERS
AND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUSTAND TECHNICIANS ACTING IN THE MECHANICAL METAL INDUSTRY MUST KNOW:KNOW:
10 USEFUL CORROSION INFORMATION THE ENGINEERS MUST KNOW: