By J. R. Davis
Offers useful discussions on thermodynamic and electrochemical rules of corrosion, popularity and prevention of assorted varieties of corrosion, kinds of corrosive environments in most cases encountered. DLC: Corrosion and anti-corrosives.
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Extra info for Corrosion: Understanding the Basics (06691G)
10 and 11. Figure 10 shows the microstructure of three different alloys. Alloy 1 is nearly pure A, alloy 2 is A with modest amounts of B, and alloy 3 is a B-rich alloy of A and B. The microstructure of alloy 1 is a single phase of alpha (a), with complete solubility of B within the alpha phase. Alloy 2 has B-additions beyond the solubility limit, and a two-phase structure results. The microstructure is made up of small islands of beta (b) phase distributed throughout a continuous matrix of alpha phase.
In other words, the passivation treatment is only useful in that it creates surface conditions (cleanliness) that can make the stainless steel more amenable to maintaining its passivation. What is the Desired Corrosive Behavior? From a corrosioncontrol standpoint, the desired behavior is either immune or passive, while the behavior to be avoided is active. Immune behavior is the most desirable, because corrosion protection does not depend on the stability of protective films. Most engineering alloys, however, are passive in their applications and thus depend on the integrity of the passive film.
The resistivity in ohm × cm and the conductivity in mho × cm are presented. Note that the conductivity values are simply the inverse of the resistivity; that is, to get conductivity, divide 1 by the value of the resistivity. 6 W × cm. This is a very low resistivity for a solution. It can be compared to the resistance of greater than 106 W for distilled water. 2 (a) Concentration is one molar (1M) instead of one normal (1 N). 0301 40 Corrosion: Understanding the Basics high-conductivity solutions.