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The third chapter pretreatment process tank

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Section 1 commonly used corrosion resistant materials and coatings


The pretreatment process trough of the hot-dip galvanizing workshop includes a degreasing trough, a pickling trough, a solvent trough and a washing trough for washing after degreasing and pickling. Degreasing liquids, acid liquids and water after washing degreasing or pickling work pieces are corrosive, so these tanks and related ground, pipelines, drainage facilities to use a variety of building anticorrosive materials and coatings. There are many kinds of building anticorrosive materials and coatings, and the corrosion resistance of various anticorrosive materials to acid, alkali, salt and other media is different. Cement materials have good alkali resistance, but poor acid resistance; asphalt materials have good dilute acid and alkali resistance, but not concentrated acid and alkali, not organic solvents; water glass materials have excellent acid resistance, but not alkali resistance; epoxy materials have good acid, alkali, salt resistance, but not strong oxidation acid resistance. . Thermodynamic laws show that a material is relatively stable under certain environmental conditions, but will be destroyed and metamorphosed under other environmental conditions. Therefore, when selecting materials, we should try our best to foster strengths and circumvent weaknesses and make the best use of them.


The corrosion resistant materials and coatings commonly used in the pretreatment process tank and related facilities of hot galvanizing workshop are shown in Tables 3-1 and 3-2 respectively.


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