Corrosion Inhibition Industry Borax Decahydrate Powder 381.37 Molecular Weight

Uses of 95% sodium tetraborate powder is metallurgical fluxes

corrosion inhibition and adhesives

 ►Product description

Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate,

is an important boron compound, a mineral, and a salt of boric acid. Powdered

borax is white, consisting of soft colorless crystals that dissolve easily in water. A

number of closely related minerals or chemical compounds that differ in their crystal

water content are referred to as borax, but the word is usually used to refer to the

decahydrate. Commercially sold borax is partially dehydrated.

Borax is a component of many detergents, cosmetics, and enamel glazes. It is

used to make buffer solutions in biochemistry, as a fire retardant, as an anti-fungal

compound, in the manufacture of fiberglass, as a flux in metallurgy, neutron-

capture shields for radioactive sources, a texturing agent in cooking, as a precursor

for other boron compounds, and along with its inverse, boric acid, is useful as an

insecticide.

In artisanal gold mining, the borax method is sometimes used as a substitute for

toxic mercury in the gold extraction process. Borax was reportedly used by gold

miners in parts of the Philippines in the 1900s.

Borax was first discovered in dry lake beds in Tibet and was imported via the Silk

Road to the Arabian Peninsula in the 8th Century AD.Borax first came into common

use in the late 19th century when Francis Marion Smith's Pacific Coast Borax

Company began to market and popularize a large variety of applications .

► Chemistry

The structure of the anion [B4O5(OH)4]2− in borax

The term borax is often used for a number of closely related minerals or chemical

compounds that differ in their crystal water content:

· anhydrous sodium tetraborate, Na2B4O7

· sodium tetraborate pentahydrate, Na2B4O7·5H2O

· setraborate decahydrate, Na2B4O7·10H2O

Borax is generally described as Na2B4O7·10H2O. However, it is better formulated

as Na2[B4O5(OH)4]·8H2O, since borax contains the [B4O5(OH)4]2− ion. In this

structure, there are two four-coordinate boron atoms (two BO4 tetrahedra) and two

three-coordinate boron atoms (two BO3 triangles).

Borax is also easily converted to boric acid and other borates, which have many

applications. Its reaction with hydrochloric acid to form boric acid is:

Na2B4O7·10H2O + 2 HCl → 4 H3BO3 + 2 NaCl + 5 H2O

The "decahydrate" is sufficiently stable to find use as a primary standard for acid

base titrimetry.

When borax is added to a flame, it produces a yellow green color.Borax is not used

for this purpose in fireworks due to the overwhelming yellow color of sodium. Boric

acid is used to color methanol flames a transparent green.

►Details  of borax 

Borax Decahydrate is the refined form of natural sodium borate. Composed of boric

oxide (B2O3), sodium oxide, and water, it is a mild, alkaline salt, white and

crystalline, with excellent buffering and fluxing properties. Available in powder or

granular form, Borax Decahydrate is an important multifunctional source of B2O3,

particularly for processes in which the simultaneous presence of sodium is

beneficial.

 ►Specification

►Features 

1. Borax Decahydrate is chemically stable under normal storage conditions. It will

slowly lose water of crystallisation if exposed to a warm, dry atmosphere.

Conversely, exposure to a humid atmosphere can cause recrystallisation at particle

contact points, resulting in caking. When storing the product, care should therefore

be taken to avoid wide fluctuations in temperature and humidity, and to ensure that

the packaging is not damaged.

2. Dissolved in water, Borax Decahydrate hydrolyzes to give a mildly alkaline

solution. It is thus capable of neutralizing acids. It also combines with strong alkalis

to form compounds of lower pH. The relatively constant pH of Borax Decahydrate

solutions makes it an excellent buffering agent.

 ►Application

1. Metallurgical fluxes

The ability of Borax Decahydrate to dissolve metal oxides is exploited in the

recovery of metals such as brass, copper, lead and zinc from scrap or smelting

slag.

In ferrous metallurgy, Borax Decahydrate is used as a cover flux to prevent

oxidation at the surface of the molten ingot. In welding, brazing, and soldering,

Borax Decahydrate covers the metal surfaces, excluding air and preventing

oxidation. It also acts as a solvent and cleaning agent.

2. Corrosion inhibition

Borax Decahydrate is incorporated in many aqueous systems requiring corrosion

inhibition. It protects ferrous metals against oxidation and finds use in the

manufacture of automotive and engine coolant formulations, and various water

treatment chemicals.The high solubility of Borax Decahydrate in ethylene glycol

makes it especially useful in car antifreeze formulations. Borax Decahydrate

neutralizes the acidic residue resulting from the decomposition of ethylene glycol

and minimizes the rate of oxidation at the surface of the metal. Aqueous solutions

of Borax Decahydrate have replaced chromates in railroad and other diesel engine

coolants.

3. Adhesives

Borax Decahydrate is part of the starch adhesive formulation for corrugated paper

and paperboard, and is a peptizing agent in the manufacture of casein-based and

dextrin-based adhesives. It greatly improves the tack and green strength of the

adhesive by crosslinking conjugated hydroxyl groups.