Corrosion Tester for Glazes and Engobes

based on ISO 28706-2 "Vitreous and porcelain enamels:

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Determination of resistance to chemical corrosion by boiling acids

boiling neutral liquids and/or their vapours of corrosion protected flat surfaces (enameled, glazed, powder-coated

flat surfaces (enameled, glazed, powder-coated)

Apparatus allows to determine qualitative and quantitative the influence of corrosive liquids and their vapours

to metallic, silicatic and other corrosion protected surfaces by

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loss in gloss

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changing the structure of surface/defects

Example for corrosive changing of surface, simulated by the test:

Procedure for testing of leaching condudct at glazes and engobes of rooftiles:

"Engoben und Glasuren auf baukeramischen Produkten - Empfehlungen zum Prüfumfang für den

Nachweis der Dauerhaftigkeit" (55. Würzburger Ziegellehrgang , Dezember2016)

Several producers of glazes and engobes are using this test for quality control.

Structure of apparatus

Test cylinder of borosilicate glass

Liebig-West reflux condenser

Thermometer

Heater for lateral heating of test-liqid

Heater for supplementary bottom heating of test-specimen

Heat-controlling device

Chucking rack equipped with rapid-grip-nuts

Set of gaskets (Silicone and others)

For special duty in Ceramics (Roof Tiles)

Testing the durability of glazed roof tiles

(leaching test acc. to KERAMIKINSTITUT Meissen)

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Adapter and gaskets for samples with not plane surfaces

(separate for liquid and vapour phase testing)

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supplementary bottom heating for liquid phase testing

(to guarantee a defined temperature of specimen)

Bottom Heating

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Test cylinder with integrated bottom

(by principled surrender of testing the liquid phase)