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By R. Winston Revie

The power to avoid disasters through handling corrosion is without doubt one of the major international demanding situations of the twenty-first century. notwithstanding, so much training engineers and technologists have just a simple realizing of the way they could actively perform this pressing fiscal and environmental factor. Now, scholars and execs can flip to this newly revised version of the relied on Corrosion and Corrosion keep watch over for insurance of the newest advancements within the box, together with advances in wisdom, new alloys for corrosion keep watch over, and advancements in keeping with public call for.

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Another factor that alters the galvanic position of some metals is the tendency, especially in oxidizing environments, to form specific surface films. These films shift the measured potential in the noble direction. In this state, the metal is said to be passive (see Chapter 6). Hence, chromium, although normally near zinc in the EMF Series, behaves galvanically more like silver in many air-saturated aqueous solutions because of a passive film that forms over its surface. The metal acts like an oxygen electrode instead of like chromium; hence, when coupled with iron, chromium becomes the cathode and current flow accelerates the corrosion of iron.

2. Linings of tanks can fail because of salt contamination of the surface that remains after the surface is prepared for the application of the lining. Between 15% and 80% of coating failures have been attributed to residual salt contamination. The cost of reworking a failed lining of a specific tank has been estimated at $174,000. [Reference: H. ] (a) Calculate the risk due to this type of failure assuming that 20% of failures are caused by residual salt contamination. (b) If the cost of testing and removal of contaminating salts is $4100, is this additional cost justified based on the risk calculation in (a)?

Accordingly, the greater the value of E for any cell, the greater the tendency for the overall reaction of the cell to go. This applies to any of the types of cells described earlier. 2 MEASURING THE EMF OF A CELL The emf of a cell, as set up in the laboratory or in the field, can be measured using a voltmeter of high impedance, >1012 Ω (ohms). Alternatively, using a potentiometer, the emf of the cell can be opposed with a known emf until no current flows through a galvanometer in series with the cell.

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