Methods for Investigating the Characteristics of Reactive Coatings
| Autor: | Max Kronstein |
|---|---|
| Rok vydání: | 1960 |
| Předmět: |
Materials science
Chromate conversion coating General Chemical Engineering Metallurgy General Engineering chemistry.chemical_element General Chemistry Manganese Zinc Ion Metal chemistry Volume (thermodynamics) Chemical engineering Conversion coating visual_art visual_art.visual_art_medium Ultrasonic sensor General Materials Science |
| Zdroj: | CORROSION ENGINEERING DIGEST. 9:359-364 |
| ISSN: | 1884-1155 0010-9355 |
| Popis: | Characteristics of iron, zinc and manganese phosphate treatments are described. Methods are given for preparing standards whose content of reaction coatings can be used for comparison in determining the weight of reaction coatings on specimen coupons, through the use of emission spectroscopy. The role of the so-called metal accelerators is defined. Greater thicknesses can be obtained by using ultrasonic waves, especially on parts of intricate cross-section. Data are given for zinc and manganese conversion coatings, and tests are described whereby the thicknesses of these coatings can be determined with a high order of accuracy. A method of determining volume of conversion coating through use of the decreasing resistance of a wash water is described. Investigation showed that the function of a dichromate sealer is to release chromate ions, which are inhibitive. Coatings containing chromic compounds apparently have no inhibitive effect. The investigation showed that a reaction product formed underneath organic coatings on steel and that it differed considerably from the composition of the paint. The amount of this reaction coating is small compared to that produced by liquid phosphatizing solutions and there was evidence that chromates in the paint are the active inhibiting agents. Another type of reaction not involving liquid phosphoric acid solutions is described for oleo-resinous paints. 5.9.4 |
| Databáze: | OpenAIRE |
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