By J. R. Davis
Offers functional discussions on thermodynamic and electrochemical ideas of corrosion, acceptance and prevention of varied different types of corrosion, kinds of corrosive environments often encountered. DLC: Corrosion and anti-corrosives.
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Offers useful discussions on thermodynamic and electrochemical ideas of corrosion, popularity and prevention of varied different types of corrosion, kinds of corrosive environments regularly encountered. DLC: Corrosion and anti-corrosives.
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Additional resources for Corrosion: Understanding the Basics (06691G)
When active behavior is observed, the metal dissolves in solution and forms soluble, nonprotective corrosion products. Corrosion or dissolution of the metal continues in this solution because the corrosion products do not prevent subsequent corrosion. Active corrosion is characterized by high weight loss of the metal. If the metal sample is weighed prior to immersion in the solution and then reweighed after the exposure period, a significant weight loss is measured. Passive Behavior. With the third behavior, the metal corrodes but a state of passive behavior is observed.
This relationship between microstructure and corrosion behavior is demonstrated in Fig. 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.
1 pm/ s ÷ ø In the United States, the most widely used expression for quantitatively defining the rate of corrosion in mils per year (abbreviated mpy or mils/yr) and calculated from: Mils per year = 534W/dAT where W is the weight loss in mg; d is the density, g/cm3; A is the specimen area, in 2. ; and T is the exposure time, h. Throughout this book, metals and nonmetals are compared on the basis of their corrosion resistance measured in mpy and the appropriate metric equivalent. Basic Concepts Important to Corrosion 47 Relationships among some of the units commonly used for corrosion rates are given in Table 8.