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Corrosion Index


Corrosion Resistant Material Notes...

Introduction

This page only relates to materials used for general mechanical engineering.
Other pages identifying Corrosion /Chemical Resistance are as follows

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 Water Sea
Water
Steam Steam
Cond'te
Air
Metal Static/Turb Static/Turb Dry Wet City/Indust
Grey Cast Iron-
Plain or Low Alloy
4/3 4/3 4 4 3
Ductile Iron
(High Strength )
4/4 4/2 4 4 3
Cast Iron Ni_Resist.
(14% Ni, 7% Cu, 2% Cr bal Fe)
5/5 5/5 5 5 4
Ductile Iron Ni_Resist.
(24 % Ni, bal Fe)
5/5 5/5 5 5 4
Mild Steel- Low Alloy steels 4/3 4/2 4 4 3
Stainless Steel Ferritic
(17% Cro)
4/6 1/4 6 5 3
Stainless Steel Austenitic
(18% Cro ,8% Ni )
6/6 2/5 6 5 4
Stainless Steel Austenitic
(18% Cro 12% Ni, 2.5% Mo )
6/6 3/5 6 6 6
Stainless Steel Austenitic
(20% Cro 29% Ni, 2.5% Mo,3.5% Cu )
6/6 4/6 6 6 6
Hastelloy Alloy
(55% Ni, 17% Mo,16% Cr, 6% Fe, 4% W)
6/6 6/6 6 6 6
Inconel
(78% ni,15% Cr, 7% Fe)
6/6 4/6 6 6 6
Copper Nickel alloys
(Up to 30% Ni)
6/6 6/6 5 6 5
Monel 400
(66% Ni, 30% Cu, 4% Si)
6/6 6/6 6 6 5
Nickel Commercial
(99% Ni)
3/5 6/6 6 6 4
Copper and Silicon Bronze 6/5 4/1 5 6 5
Aluminium Brass 6/6 4/5 5 6 5
Bronze
(88% Cu,5% Sn,5% Ni,2% Zn)
6/6 5/5 5 6 5
Aluminium Alloys 4/5 0-5/4 2 5 5
Lead (Chemical or antimonial) 6/5 5/3 0 2 5
Silver 6/6 5/5 5 6 6
Titanium 6/6 6/6 5 6 6
Zirconium 6/6 6/6 5 6 6


Links to Materials for Corrosion Resistance
  1. Corrosion Doctors ...An excellent reference site for the very important topic of corrosion
  2. Omega...Chemical Chart-Some Plastics
  3. dultmeier -> Chemical Compatibility charts...Relatively extensive Chemical Chart
  4. Chemical Compatibility ...Cole Porter ..American site with very clear information on chemical compatibility
  5. Corrosionist: Corrosion Data ...Links to lots of Corrosion lists
  6. Sandvik-Corrosion Tables .....Chemical resistance of Sandvik steels - (Can be used as representative materials)


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Please Send Comments to Roy@roymech.co.uk

Last Updated 17/01/2013