Optimization and semi-automatic evaluation of a frosting process for a soda lime silicate glass based on phosphoric acid

  • Chemical glass frosting processes are widely used to create visual attractive glass surfaces. A commonly used frosting bath mainly contains ammonium bifluoride (NH4HF2) mixed with hydrochloric acid (HCl). The frosting process consists of several baths. Firstly, the preliminary bath to clean the object. Secondly, the frosting bath which etches the rough light scattering structure into the glassChemical glass frosting processes are widely used to create visual attractive glass surfaces. A commonly used frosting bath mainly contains ammonium bifluoride (NH4HF2) mixed with hydrochloric acid (HCl). The frosting process consists of several baths. Firstly, the preliminary bath to clean the object. Secondly, the frosting bath which etches the rough light scattering structure into the glass surface. Finally, the washing baths to clean the frosted object. This is where the constituents of the preceding steps accumulate and have to be filtered from the sewage. In the present contribution, phosphoric acid (H3PO4) was used as a substitute for HCl to reduce the amount of ammonium (NH4+) and chloride (Cl−) dissolved in the waste water. In combination with magnesium carbonate (MgCO3), it allows the precipitation of ammonium within the sewage as ammonium magnesium phosphate (MgNH4PO4). However, a trivial replacement of HCl by H3PO4 within the frosting process causes extensive frosting errors, such as inhomogeneous size distributions of the structures or domains that are not fully covered by these structures. By modifying the preliminary bath composition, it was possible to improve the frosting result considerably. To determine the optimal composition of the preliminary bath, a semi-automatic evaluation method has been developed. This method renders the objective comparison of the resulting surface quality possible.show moreshow less

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Document Type:Article
Author:Dipl.-Ing. Florian KleinerORCiD
DOI (Cite-Link):https://doi.org/10.1111/ijag.15866Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20210701-44548Cite-Link
URL:https://ceramics.onlinelibrary.wiley.com/doi/10.1111/ijag.15866
Parent Title (English):International Journal of Applied Glass Science
Publisher:John Wiley & Sons
Language:English
Date of first Publication:2021/01/06
Release Date:2021/07/01
Publishing Institution:Bauhaus-Universität Weimar
Institutes and partner institutions:Fakultät Bauingenieurwesen / F. A. Finger-Institut für Baustoffkunde
Pagenumber:8
First Page:1
Last Page:8
Tag:automated quality control; etching; glass frosting; phosphoric acid
GND Keyword:Silicatglas; Mattieren; Ätzen
Dewey Decimal Classification:500 Naturwissenschaften und Mathematik
BKL-Classification:51 Werkstoffkunde / 51.20 Werkstoffoberflächeneigenschaften
51 Werkstoffkunde / 51.79 Sonstige Werkstoffe
Licence (German):License Logo Creative Commons 4.0 - Namensnennung-Nicht kommerziell (CC BY-NC 4.0)