Corrosion of Porous Building Ceramics Caused by Double Sulphate Salt
Open Access
Abstract
Porous materials are subjected to the corrosive effects of soluble salts. This corrosion, typically known as efflorescence, is primarily superficial. However, internal corrosion within the material is also frequently observed. This article presents a simulation of volumetric damage in sintered porous ceramic materials (made of clay (75 vol.%), quartz sand (10 vol.%), and sawdust (15 vol.%), fired at 950 °C), caused by the crystallization of double salts, specifically ploweite (6Na2SO4·7MgSO4·15H2O) and/or glauberite (CaSO4·Na2SO4). The exact mechanism responsible for the formation and interaction of these salts has yet to be fully comprehended. It is established that this mechanism occurs in ceramic materials containing calcium compounds and in mixtures of Na2SO4 and MgSO4 salts. Dissolved Na2SO4 acts as a substrate for the formation of glauberite, while dissolved MgSO4 participates in intermediate reactions (which are necessary for the creation of glauberite).Keywords
Funding Information
- AGH University of Krakow (16.16.160.557)
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