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    Metal Corrosion Properties - Non Chemical Environments

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    Talib Al_Munawri
    Director-General
    Director-General

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman

    Metal Corrosion Properties - Non Chemical Environments

    Post by Talib Al_Munawri on Wed Oct 20, 2010 8:55 pm



    In normal mechanical and structural engineering design materials are selected primarily for their mechanical properties-corrosion is not an important criteria. The systems are generally protected against corrosion by surface coatings.

    Most machines are located indoors and are accessible for inspection and maintenance. The exceptions to this are machines used for construction and agriculture. These machines may well be used in corrosive environments but they are generally regularly maintained and some level of corrosion is acceptable.

    In process engineering corrosion is a very important design factor and materials are selected primarily on their resistance to chemical attack (corrosion). Surface coatings are often not considered because of the risk of contaminating the process stream.


    Metal Corrosion Properties - Non Chemical Environments
    Ratings 0 = Unsuitable, 1 = poor, 2 = Fair, 3 =Fair to Good, 4 good, 5 = good to excellent, 6= excellent.




    Fresh WaterSea
    Water
    SteamSteam
    Cond'te
    Air
    MetalStatic/TurbStatic/Turb DryWetCity/Indust
    Grey Cast Iron-
    Plain or Low Alloy
    4/34/3443
    Ductile Iron
    (High Strength )
    4/44/2443
    Cast Iron Ni_Resist.
    (14% Ni, 7% Cu, 2% Cr bal Fe)
    5/55/5554
    Ductile Iron Ni_Resist.
    (24 % Ni, bal Fe)
    5/55/5554
    Mild Steel- Low Alloy steels4/34/2443
    Stainless Steel Ferritic
    (17% Cro)
    4/61/4653
    Stainless Steel Austenitic
    (18% Cro ,8% Ni )
    6/62/5654
    Stainless Steel Austenitic
    (18% Cro 12% Ni, 2.5% Mo )
    6/63/5666
    Stainless Steel Austenitic
    (20% Cro 29% Ni, 2.5% Mo,3.5% Cu )
    6/64/6666
    Hastelloy Alloy
    (55% Ni, 17% Mo,16% Cr, 6% Fe, 4% W)
    6/66/6666
    Inconel
    (78% ni,15% Cr, 7% Fe)
    6/64/6666
    Copper Nickel alloys
    (Up to 30% Ni)
    6/66/6565
    Monel 400
    (66% Ni, 30% Cu, 4% Si)
    6/66/6665
    Nickel Commercial
    (99% Ni)
    3/56/6664
    Copper and Silicon Bronze6/54/1565
    Aluminium Brass6/64/5565
    Bronze
    (88% Cu,5% Sn,5% Ni,2% Zn)
    6/65/5565
    Aluminium Alloys4/50-5/4255
    Lead (Chemical or antimonial)6/55/3025
    Silver6/65/5566
    Titanium6/66/6566
    Zirconium6/66/6566

      Current date/time is Sun Dec 17, 2017 3:41 am