Water glass corrosion

Storage stability Store DF in lead and wax-lined carboys, high-density polyethylene bottles, or nickel-lined containers in well-ventilated areas. Never store DF with alcohols DF will react with alcohols to form lethal chemicals, such as crude GB. Incompatible with water, glass, concrete, most metals, natural rubber, leather, and organic materials like glycols. The acidic corrosive hydrolysis products may react with metals, such as Al, Pb, and Fe, to give off hydrogen gas, a potential fire and explosive hazard. 

The failure of models based on application of TST rate laws to glass/water systems does not mean, however, that diffusion through a leach layer is by default the answer to this dilemma. Clearly, the set of recently reported data on glass corrosion resistance shows that it is not an either-or situation between affinity- and diffusion-based rate laws. Finding a mathematically stable form of the rate equation appears to be more worthy of pursuit. 

Hazard Extremely reactive. Destroys glass instantly, attacks quartz readily in presence of moisture. Organic matter bursts into flame on contact. Violent reaction with water. Extremely corrosive to skin, eyes, mucous membranes, and respiratory tissues. 

CHEMICAL PROPERTIES stable under ordinary conditions of use and storage hydrolyzes slowly in water to telluric acid (H606Te) more quickly hydrolyzed by aqueous potassium hydroxide when pure, does not attack glass corrosive to mercury not as chemically inert as sulfur hexafluoride (SF(,) and selenium hexafluoride (SeFs) because the maximum covalence of tellurium is greater than six FP (NA) LFLZUFL(NA) AT(NA) HC(NA) HF(-1318.0 kJ/mol gas at 25 C) Tc (83 C, 181.4 ). 

It is not the attack of the matrix Si3N4, which controls aqueous corrosion but that of the grain-boundary phase. Often this grain-boundary phase is a oxidic silicate glass with or without small nitrogen contents. To predict the corrosion resistance in water, acids, and bases the reader is thus referred to the literature on glass and glass corrosion [118,119]. 

Under equal conditions the diffusion coefficients for d vaiy greatly in different cements (see Table 20.4). In general, blended cements that contain blast furnace slag, fly ash or silica fume exhibit a lower permeability to chloride ions and are more suitable for protecting the steel reinforcement from corrosion (Jensen and Pratt, 1989 Aiya et al, 1990 Schiessl and Raupack, 1992 Deja, 1997 El Sayed et al, 1997 Wiens and Schiessl, 1997). An extremely low permeability was also found in alkali-activated slag cement activated with water glass (Deja, 1997). 

XPS has also been applied recently in this field to copper films for the study of microbial effects [55], the behavior of UO2 in mineral water [56], corrosion-resistant amorphous alloys [57]-[59], and the hydrolysis of fluorozirconate glasses [60]. 

Bange, K., Anderson, A., Rauch, F., Lehuede, P., Radlein, E., Tadokoro, N., Mazzoldi, P., Rigato, V., Matsumoto, K. Famworth, M. (2001). Multi-method characterization of soda lime glass corrosion Part 1. Analysis techniques and corrosion in liquid water. Glasetechniche Beriche, 74(5), 124-41. 

Preparative Method several syntheses have been reported. Handling, Storage, and Precautions water sensitive corrosive should be stored in a glass container under an inert atmosphere a lachrymator flammable (fp 46 °C). 

One particular case of glass corrosion is quite similar to the crevice corrosion of metals with the main difference that the presence of condensed water in the crevice produces an alkaline environment instead of the acidic environment in the case of metals. However, that alkaline environment is particularly corrosive to glass. Such crevices are commonly produced when the seal of a double-pane window is broken. 

Fluorine is the most electronegative and reactive of all elements. It is a pale yellow, corrosive gas, which reacts with most organic and inorganic substances. Finely divided metals, glass, ceramics, carbon, and even water burn in fluorine with a bright flame. 

Zinc phosphate, Zn2(P0 2> forms the basis of a group of dental cements. Chromium and zinc phosphates are utilized in some metal-treating appHcations to provide corrosion protection and improved paint adhesion. Cobalt(II) phosphate octahydrate [10294-50-5] Co2(P0 2 8H20, is a lavender-colored substance used as a pigment in certain paints and ceramics. Copper phosphates exhibit bioactivity and are used as insecticides and fungicides. Zinc, lead, and silver phosphates are utilized in the production of specialty glasses. The phosphate salts of heavy metals such as Pb, Cr, and Cu, are extremely water insoluble. 

ALkylamines are corrosive to copper, copper-containing alloys (brass), aluminum, 2inc, 2inc alloy, and galvani2ed surfaces. Aqueous solutions of aLkylamines slowly etch glass as a consequence of the basic properties of the amines in water. Carbon or stainless steel vessels and piping have been used satisfactorily for handling aLkylamines and, as noted above, some aLkylamines can act as corrosion inhibitors in boiler appHcations. 

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