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Publication Information and Contributors. Surface by Cotell C.M., Sprague J.A.

By Cotell C.M., Sprague J.A.

You will study all of the techniques to be had to enhance the functionality of metal and chosen nonmetallic elements besides techniques that may be applied to reinforce visual appeal and corrosion resistance, in addition to put on, thermal, and electric houses. you are going to additionally locate hundreds of thousands of tables, graphs, and charts that describe technique parameters, answer compositions, working stipulations, requirements etc besides various photos and schematic drawings of methods and gear.

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One manufacturer descales heat treated aircraft parts in an alkaline descaling bath, using direct current and cyanide additions. Another manufacturer descales similar work in an alkaline bath operated at 82 to 93 °C (180 to 200 °F) with a lower concentration of descaling compound, 60 to 90 g/L (8 to 12 oz/gal), and no cyanide. The latter bath is operated at a current density of 2 to 20 A/dm2 (20 to 200 A/ft2) and with periodic current reversal (55 s anodic, followed by 5 s cathodic). Alkaline permanganate baths are also used for descaling.

It is very slow and is less sensitive than the water-break and atomizer tests. Weight of residual soil is also an evaluation of cleanness. The cleaned panel is washed with ether, the washings are evaporated, and the residue is then weighed. A modified method is to clean, dry, and weigh the test panel, then soil, clean, dry, and reweigh it. The increase in weight represents the amount of residual soil present. Wiping method is a qualitative test. A panel is coated with pigmented soil, cleaned, and then wiped with a white cloth or paper.

The presence of soil on the cloth or paper indicates poor cleaning. In the residual pattern method, cleaned panels are dried at 49 °C (120 °F) for 20 min. After drying, the presence of a stained area indicates residual soil and incomplete cleaning. Radioisotope tracer technique requires that radioactive atoms be mixed with the soil. Panels are coated uniformly with the soil, and their radioactivity is determined. The panels are then subjected to various cleaning cycles, after which their radioactivity is again determined.

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