Removal and prevention of stone spitting yellow phenomenon
Apr 14, 2021
People to vomit yellow stone stone industry, rusty spot and straw rope phenomenon should have experience greatly, because most people for stone conservation this concept is known to cause such as weak, often wait to engineering problems arise to use "which the unrest which" way to remedy, why don't we take the "prevention" to put an end to the happening of the problem?
First of all, we should make clear the cause of stone spitting yellow and rust.
Stone raw material iron content is high (such as the United States white hemp), carbon dioxide and water in the air into the stone surface, and the stone internal iron reaction to produce iron dioxide, and through the stone capillary discharge, the formation of yellow spot.
2.Stone in the process of sawing surface residual iron scraps, such as water washing is not clean, long-term storage and rust.
3.Rust spots caused by rust of anchoring steel bars.
4.Stone products bundled with straw rope packaging, water or damp, long-term storage or long-distance transportation, easy to cause stone color change.
5.Stone wet hanging installation, cement mortar in the curing process, through the stone capillary hole will be the pigment in the mortar discharged from the stone surface, the formation of color spots, especially light or white stone (such as jazz white, Yashi white, Spanish beige) is most prone to this phenomenon.
The method of removing the above stone spitting yellow can be divided into two kinds: physical removal and chemical removal.
Physical clearance: with polishing abrasives will wear off the yellow spot.But this method is more suitable for the flat stone has not been installed, for the installed stone or irregular stone meaning is little, and the cost of labor and material.
Chemical removal: as we all know, the main composition of rust is a mixture of ferric hydroxide and ferric hydroxide.Therefore, as long as the material and method are correct, chemical removal is the most simple and economical.The traditional chemical cleaning agent mainly has two kinds, namely by hydrochloric acid, corrosion inhibitor, acid mist Yang preparation, activator and so on preparation of hydrochloric acid rust remover and oxalic acid rust remover (oxalic acid prepared by saturated solution).These two advantages are fast cleaning, low cost, but after treatment if not timely water washing or washing is not thorough, often backfire, not yellowing, treated place but "relapse", serious damage to the gloss of the stone.
