How does Pitting corrosion occur? /Localised corrosion: Electrochemical corrosion

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  • Опубликовано: 30 окт 2024

Комментарии • 81

  • @sajidhasa5209
    @sajidhasa5209 5 лет назад +7

    may be you should join VIT mam.-VIT STUDENT.

  • @johnberger4948
    @johnberger4948 2 года назад +3

    This was a great teaching!! This is helpful for my level 2 inspector exam

  • @konstantinshalnov6288
    @konstantinshalnov6288 6 месяцев назад

    Best explanation of corrosion on RUclips!

  • @chemengineer2006
    @chemengineer2006 5 лет назад +3

    you are doing a very good job , my respect

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад +1

      Thank you very much.

    • @chemengineer2006
      @chemengineer2006 5 лет назад

      I am Corrosion Engineer and plan to listen to your videos , you present corrosion science in a simple way

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      There are nearly ten videos on corrosion and its control. You can watch if it is relevant to you.

  • @suthanprasad
    @suthanprasad 4 года назад +1

    Nice presentation mam easy to understand ur explanations

  • @kedardhane.1163
    @kedardhane.1163 3 года назад

    Very clear explained, more that book.

  • @viveksurendran9505
    @viveksurendran9505 2 года назад

    Thank you for this video.

  • @andippankavitha2509
    @andippankavitha2509 4 года назад +1

    Excellent presentation

  • @svanitha3272
    @svanitha3272 4 года назад +1

    Nice explanation

  • @jayeshahirrao3868
    @jayeshahirrao3868 4 года назад +1

    Wow superb 😍 it just cleared all me doubts ❤️

  • @MuhammadUsman-pq8iz
    @MuhammadUsman-pq8iz 4 года назад +1

    Mam you're doing a wonderful job please upload more videos like these and I've one question which protection is the most economical among them and why??
    Please reply mam

    • @RevathiPurushothaman
      @RevathiPurushothaman  4 года назад +1

      Thank you. This cannot be answered in one sentence. We need to choose the method based on the situation and condition. Each method has its own pros and cons.

    • @MuhammadUsman-pq8iz
      @MuhammadUsman-pq8iz 4 года назад

      Okay Thank you so much mam for the quick reply ☺️

    • @RevathiPurushothaman
      @RevathiPurushothaman  4 года назад

      Most welcome.

  • @786karthik
    @786karthik 5 лет назад +1

    Fantastic

  • @suhailfsheikh7596
    @suhailfsheikh7596 4 года назад

    Ma'am if a small steel pipe is placed in a large copper tank,
    Steel- Anode(small)
    Copper- cathode(large)
    So will the corrosion be pitting corrosion?? Or will it be differential metal corrosion??

    • @RevathiPurushothaman
      @RevathiPurushothaman  4 года назад

      It depends on how it is placed. If it is immersed completely, corrosion will take place evenly on all sides of the mild steel pipe. Only if a small portion is exposed like a scratch in a coating, pitting corrosion will occur.

  • @teamtamilans6955
    @teamtamilans6955 5 лет назад

    Nice I like ur explanation tomorrow semester exam I am presenting ur vedio in answer paper

  • @chandramoulijeyaram8524
    @chandramoulijeyaram8524 5 лет назад +1

    Mam, if I give earthing of battery on cast iron and if there is a rubbing happening on one particular point on it will become similar case as you said large cathode and small anodic area??

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      Not just by rubbing, because a single metal is present here and it cannot remove any coating. But if something which is rubbing is a small area and constantly in contact with the metal, then the metal underneath that small contact area will act as anode and undergoes differential aeration corrosion and also pitting corrosion.

  • @mithuandoviailovemymothers6716
    @mithuandoviailovemymothers6716 4 года назад +1

    Thankyou mam

  • @iamsosweetgahayah2977
    @iamsosweetgahayah2977 5 лет назад

    Wow superb explanation mam

  • @suhailfsheikh7596
    @suhailfsheikh7596 4 года назад

    So of it is completely immersed , what type of corrosion will take place? Pitting or galvanic?????

    • @RevathiPurushothaman
      @RevathiPurushothaman  4 года назад

      If both the metals in contact with each other and are in presence of a corrosive medium, then galvanic corrosion occurs.

  • @amolmali1308
    @amolmali1308 4 года назад

    Excellent madam

  • @Indiansports421
    @Indiansports421 3 года назад

    Can u telle how to make cold phosphate chemical for grey colour coating?

  • @ramakrishnan6913
    @ramakrishnan6913 3 года назад

    You said pitting corrosion can be prevented if the anodic area is larger compared to cathodic area . How this can be possible in case of differential aerated corrosion . Please give an example

    • @RevathiPurushothaman
      @RevathiPurushothaman  3 года назад

      In this example, prevent dust accumulation. Good maintenance can prevent.

  • @AbhishekDixit-y5x
    @AbhishekDixit-y5x 21 день назад

    mam please make a video on intergranular corrosion

  • @divyadurga358
    @divyadurga358 4 года назад

    Very nice explanation madam,thank you so much mam😊

  • @janand78
    @janand78 10 месяцев назад +1

    Thank you for your efforts
    Can able to get contact I need for Class NACE Senior corrosion technologies course

  • @afsharhamed718
    @afsharhamed718 5 лет назад

    Awesome video, I have few questions in regards to galvanic corrosion, would it be possible to contact you directly? its in regards to a product i have developed and unfortunately during the spray salt test 200 hr, it was a non compliance, if you could assist me that would be highly appreciate

  • @sruthipanuganti627
    @sruthipanuganti627 6 лет назад

    Good explanation and thank you

  • @Placement360India
    @Placement360India 5 лет назад

    What is the driving force behind the conversion of Fe to Fe 2+....

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      Generally most of the metals are unstable, except some noble metals. All metals tend to go the combined state rather than being in its metal state. In both the cases, when iron acts as the anode, it undergoes oxidation i.e. Fe to Fe2+. The driving force for corrosion depends on the electrode potential of the overall reaction.

    • @Placement360India
      @Placement360India 5 лет назад

      @@RevathiPurushothaman can I not say that the atmospheric O2 being an oxidizing agent wants electrons whenever he finds a region which is rich in electrons( in this case Fe metal) and so Fe becomes converted into Fe2+ ?

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      Your argument may hold good for dry corrosion, where the oxygen present in the atmosphere oxidises the metal. But in this case it is wet corrosion (electrochemical corrosion), where the corrosive medium plays a major role to drive the corrosion.

    • @Placement360India
      @Placement360India 5 лет назад

      @@RevathiPurushothaman yes ....now I'm satisfied....thank you♥️

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      You are welcome.

  • @rchopra386
    @rchopra386 2 года назад

    I am highly impressed and feel respect for u. I am in a d&a company and have got some technical doubt? It will be very helpful if u could give ur mail.

    • @RevathiPurushothaman
      @RevathiPurushothaman  2 года назад

      Thanks for your compliments and support.

    • @rchopra386
      @rchopra386 2 года назад

      @@RevathiPurushothaman Mam we are struggling a lot due to pitting issue in. Al- AA2014. Can u suggest some preventive measures. As of now we apply SAE 30 oil .

    • @rchopra386
      @rchopra386 2 года назад

      Mam i m waiting for ur reply.

  • @ramakrishnan6913
    @ramakrishnan6913 3 года назад

    If the oxide layer breaks up , this oxide layer forms immediately, say S.S, Copper,Al,Ag mtrls.etc. In that cases corrosion should not occur.

    • @RevathiPurushothaman
      @RevathiPurushothaman  3 года назад

      Oxide layer will form immediately only in case of passive metals such as Al, Tii etc.

  • @gkpatilpatil6588
    @gkpatilpatil6588 4 года назад

    Good morning

  • @shahnawazsamejo3847
    @shahnawazsamejo3847 5 лет назад

    If anode area larger than other type corrosion will not accur?

    • @RevathiPurushothaman
      @RevathiPurushothaman  5 лет назад

      It can lead to galvanic corrosion or differential aeration corrosion etc, but it will to drastic corrosion, which will be in the form of pit. Hence pitting corrosion also.

  • @kasipavankalyan9109
    @kasipavankalyan9109 5 лет назад

    the best

  • @R_o-c_k_s_t_a_r
    @R_o-c_k_s_t_a_r 6 лет назад

    Thanks

  • @rahulrgd4128
    @rahulrgd4128 4 года назад

    May be translates in Tamil
    But think pls
    Oru meanings pls
    Explaintion must in Tamil

    • @RevathiPurushothaman
      @RevathiPurushothaman  4 года назад

      Only limited number of audience can be benefitted, if explained in the vernacular language. You can watch any no. of times to understand.

  • @awakenhindu2513
    @awakenhindu2513 6 лет назад

    Best

  • @gurunathshinde4552
    @gurunathshinde4552 4 года назад

    Nice Information...
    Madam can I get ur email id as I have some doubt in my work about Corrosion