Rust, bleaching

Oxidation The chemical process of combining a substance with oxygen. Rusting, bleaching, and even breathing are all forms of oxidation. 

Redox reactions occur in the reduction of ores (metal oxides) into pure metals and the corrosion (oxidation) of pure metals in the presence of oxygen and water. Rusting iron, 4Fe + 30, + 611,0 —> 4Fe(OH), is a good example of metal oxidation. Strong oxidizing agents can be used as antiseptics (hydrogen peroxide, Fd,0,) or bleaches (sodium hypochlorite, NaOCl). 

Read the labels before mixing household cleansers. Many toilet-bowl cleaners contain acidic solutions, as do some drain cleaners, rust removers, and, of course, vinegar. Never mix bleach with these products. You could sustain permanent lung damage. 

Metal-ion catalysis of hydrogen peroxide decomposition can generate perhydroxyl and hydroxyl free radicals as in Scheme 10.26 [235]. The catalytic effects of Fe2+ and Fe3+ ions are found to be similar [235]. It is not necessary for the active catalyst to be dissolved [237], as rust particles can be a prime cause of local damage. The degradative free-radical reaction competes with the bleaching reaction, as illustrated in Scheme 10.27 [237]. Two adverse consequences arise from the presence of free radicals ... 

Used industrially for etching glass, as an antiseptic and disinfectant, as a leather bleach, in the production of tin plate, for rust removal, as a welding flux, as a neutralizer in laundry rinsing operations, and as a cleaner for stone and brick building faces. Used to preserve zoological and anatomical specimens. 

Epoxy acrylate, DIBFe,f TMPTA 5% 40 30 % pickoff 10 10 500g Few to medium no. 2 blisters A little rust around the edges Bleaching... 

Cycloaliphatic epoxy III DIBFg J. 0% 60 60 % pickoff 5 50 400g Overall wrinkling Moderate rusting Dense 6 blisters Bleaching... 

Uses Solvent for chlorinated rubber insecticide and bleach manufacturing paint, varnish and rust remover manufacturing degreasing, cleansing, and drying of metals denaturant for ethyl alcohol preparation of 1,1-dichloroethylene extractant and solvent for oils and fats insecticides weed killer fumigant intermediate in the manufacturing of other chlorinated hydrocarbons herbicide. 

Uses. Chemical synthesis bleaches metal polish rust remover... 

Whenever you start a car, use a battery-powered device, apply a rust inhibitor to a piece of metal, or use bleach to whiten your clothes, you deal with some aspect of electrochemistry. Electrochemistry is that branch of science that involves the interaction of electrical energy and chemistry. Many of our daily activities use some form of electrochemistry. Just imagine how your life would be in a world without batteries. What immediately comes to mind is the loss of power for our portable electronic devices. While this would certainly be an inconvenience, consider the more critical needs of those with battery-powered wheelchairs, hearing aids, or heart pacemakers. In this chapter, we examine the basic principles of electrochemistry and some of their applications in our lives. 

PLEX HT is a blend of chelating agents which has the ability to dissolve iron rust from cotton and cotton blend fabrics in strong caustic solutions such as are used in saturation of cotton fabric prior to continuous peroxide bleaching. It also has the ability to keep the chelated iron from redeposition as the pH drops during subsequent rinsing. 

PLEX HT works effectively to remove iron rust even in the peroxide bleach bath in batch processes such as bleaching prior to dyeing on becks and on jets. It also works well in the bleach bath on continuous one stage machines such as the Jemco range and the Argarthen machine. 

SEQ 100 is used in preparation of cotton and cotton blend fabrics and also can be used in scouring synthetic fabrics when there is a substantial amount of interfering heavy metals on the fabrics. A concentration of 0.1% on the weight of the bath in the caustic scour prior to peroxide bleaching will remove calcium, magnesium and copper but very little iron as the metal or as the rust. If it is necessary to remove ron or rust, other products such as SEQ CF in strong caustic are recommended. 

Oxidation-reduction reactions, also known as redox reactions, are chemical processes in which electrons are transferred from one atom, ion, or molecule to another. Explosions, fires, batteries, and even our own bodies are powered by oxidation-reduction reactions. When iron rusts or colored paper bleaches in the sun, oxidation-reduction has taken place. 

Clean your equipment. Giv< tools a little tender loving care before storing them away. Clean them with a 10 percent bleach solution, wipe them dry, and coat them lightly with household oil to prevent rust. 

Use Zinc salts and other zinc compounds, reducing agent, precipitating agent, purifier, catalyst, rust-resistant paints, bleaches, pyrotechnics, soot removal, pipe-thread compounds, sherardizing, decorative effect in resins, autobody coatings. 

Bleaching Why can t rust stains be removed with bleach ... 

Aquene 212. [Leatex] Organic amino deriv. chelating ent fa iroi and otha polyvalent metal ions prevents rust stains a iron spots in peroxide bleach systems with tqjtical brighten-eis. 

Sodium dithionite Bleaching textiles, pulp and paper removing rust stains... 

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