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How to protect steel from corrosion?

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Question ajoutée par Mustafa Muhendes , Assistant executive engineer , Sanco construction company
Date de publication: 2017/10/31
Jayant Taman
par Jayant Taman , Trackwork Inspector , MHI

By galvanising or by applying anti corrossive paint

gerry mccloskey
par gerry mccloskey , Maintenance support engineer , Maaden

Galvanize, paint,epoxy coating

Mujtaba Ahmad  Fazili
par Mujtaba Ahmad Fazili , Quantity Surveyor , Al-Musairie Trading and Contracting Co W.L.L

By using anti Corrosive agent before using it in RCC

bahram haghighi
par bahram haghighi , Project Manager , SSK - construction contractor

By coating (galvanization, painting,..), cathodic protection, sacrificial anode , etc. It depends on environment 

 

 

mohamed elhilali
par mohamed elhilali , INGÉNIEUR CONTRÔLEUR , BUREAU DE CONTRÔLE SOCOPREC

1. Application of zinc coating – steel galvanization it’s a process which creates a coating of zinc over metals surface.

2. Application of paint coating – painting creates coating barrier to moisture (which also beautifies metal structures).

Sameh Said
par Sameh Said , Production Manager , Al Saghyir Boilers & Pressure Vessels Factory C. LTD.

Surface preparation:1. Painting type (with using coting system to avoid the corrosion.2. Hot dip Galvanizing.

RAASHID KHAN MOHAMMED ZAKIR
par RAASHID KHAN MOHAMMED ZAKIR , Senior Piping Engineer , Worley Engineering India Pvt ltd

addition of chromium to steel increase its corrosion  resistance.

Rafael Tovar
par Rafael Tovar , Construction Project Manager , Urbania Developer

If you wish to protect steel structures from corrosion, you need to consider the following:

If the metal does not present corrosion, apply an anticorrosion agent, epoxy or special primer to the structure before applying final coat of finish paint. If metal will be exposed to extreme sea mist and/or sea crystals, then a special marine paint or epoxy must be apply as finishing paint according to the manufacturer's instructions.

If the metal presents signs of corrosion in a small amounts, you need to apply a sandblasting bath to remove all corrosion,  sand off any extra corrosion not removed by sandblasting and apply anticorrosion primer or epoxy, before applying finished coat of marine paint.

If metal presents corrosion to the point of loosing 1/3 its size or more, it must be replaced and not repaired. Trying to repair the structure at this point will present a hazzard situation and will put in danger the  strength and resistence of the steel.

Mohamed Selima
par Mohamed Selima , Mechanical Project Engineer , Nascom

1-Corrosive Layer by the designer according to the construction code (may be4-8mm)

2-Galvanized Layer

3-sacrifice anodes (cathodic protection)

4-paintings(epoxy especially) with sand blasting

                       first of all you cant protect steel from corrosion

Ramakrishnan Pallipurath
par Ramakrishnan Pallipurath , Sr. Engr- Rotating Equipment , Petrofac Sharjah

Any protection method that would protect surface of steel from oxidinsing:

 

1) Painting / coating.

2) Cathodic protection.

Ahmed Fathi
par Ahmed Fathi , Senior Electrical Engineer , Al Fawzani for trading and contracting LTD. company

Prevent uniform attack corrosion by protecting the metal surface. Uniform attack corrosion (sometimes shortened to "uniform" corrosion) is a type of corrosion that occurs, appropriately, in a uniform fashion over an exposed metal surface. In this type of corrosion, the entire surface of the metal is under attack from corrosion and, thus, the corrosion proceeds at a uniform rate. For example, if an unprotected iron roof is regularly exposed to rain, the entire roof surface will come into contact with roughly the same amount of water and thus will corrode at a uniform rate. The easiest way to protect against uniform attack corrosion is usually to put a protective barrier between the metal and the corroding agents.This can be a wide variety of things - paint, an oil sealant, or an electrochemical solution like a galvanized zinc coating.

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