Corrosion of natural pigment - red lead lead

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2020-05-27 23:20:07

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Lead oxide, or lead oxide (Pb3O4) – chemically resistant substance, insoluble in water and sulfuric acid. Is best known as a high quality natural pigment of the orange or brick-red color that is part of the anti-corrosion primers and paints that are widely applied in painting practice.

Description

Red lead lead (GOST 19151-73) is a heavy crystalline powder, with a particle size of from 2 to 10 µm, which is obtained by the process of thermal oxidation of litharge-lead semi-finished and powder air oxygen. The substance has high density, is the strongest oxidizing agent. lead MiniumThe Last property determines the scope of its application as anti-corrosive agent in the composition of the soil, caulking, paint, putty, etc. When entering the red lead reacts with the iron on the metal surface formed a dense impervious oxide film which protects the treated surface of metal from rust. It is produced only in chemical factories. The substance is quite toxic and, in accordance with the Russian standard, is related to the first class of danger, therefore, is made on the basis of the paint ‘Red lead" is prohibited for use in residential and public buildings.

Usage

The Main purpose of lead pigment – providing high anti-corrosion properties of paint formulations that are applied to metal structures and surfaces, including damaged or rust with remnants of scale. Paint minium leadThese materials are widely used in shipbuilding for priming and painting of exterior surfaces exposed to salt water and atmospheric phenomena. Minium lead is not afraid of aggressive environment, has high adhesion, is an effective corrosion inhibitor. It can be used for protective decorative coating concrete and reinforced concrete structures. In addition, minium, lead required for battery manufacturing and in the production of crystal and some brands protective, resistant to radiation and optical glass. In the chemical industry it serves as the agent in the preparation of the acetate, carbonate and other compounds of lead. Heavy-bodied red lead lead is the basis of resistant putties and plasters, which are used in the Assembly of oil, steam and water pipelines. Practiced the use of the above pigment to protect against gamma radiation, as well as for the manufacture of matches and some thermite explosives.

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Method of paint application “Minium lead”

Before using the paint must be thoroughly mixed and, if required, to dilute to the desired viscosity with solvents: with solvent or white spirit. Can for this use and a mixture of toluene with solvent in the ratio 1:1. The surface to be painted, must be cleaned and degreased. Ready to paint, the temperature of which should not be lower than 15 OC, should be applied in two layers with a brush, roller or spray gun. This should take into account and temperature (5 to 35 degrees). To dry each layer is given at least 2 hours. During the painting the red lead should be mixed as often as possible, to avoid sedimentation of heavy particles of the substance on the bottom of the tank.

Packaging, storage and transport of pigment

Lead Oxide is Packed in steel flasks, wooden or plastic barrels, plywood, steel or cardboard-wound drums, special soft disposable containers. lead Minium GOSTContainers should be waterproof. Transported by any means of transport in compliance with the rules of protection against the ingress of atmospheric moisture. Store lead pigments Packed in dry closed warehouses at -40 OC... +40 OWith no more than 1 year from the date of manufacture. Given that red lead lead toxic, during the transportation and storage should adhere to necessary safety measures.


Article in other languages:

PL: https://www.tostpost.com/pl/biznes/42152-antykorozyjny-naturalny-pigment---minium-o-owiany.html

PT: https://www.tostpost.com/pt/neg-cios/41856-antikorroziynyy-natural-pigmento---minium-de-chumbo.html

ZH: https://www.tostpost.com/zh/business/50243-corrosion-of-natural-pigment---red-lead-lead.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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