Oxytreat Scavanger Plus is a catalysed liquid solution of Hydrazine and diethylhydroxylamine (DEHA). Its volatile properties ensure distribution throughout the boiler and condensate system, and hence protects against oxygen corrosion in all parts of the system. The product also provides the required conditions for the establishment of a passivating layer of magnetite on all inner surfaces. RXSOL-50-5022-025 is a low toxicity product, suitable for high, medium and low pressure boiler systems.
The establishment of protective metal oxide lay-ers through the use of reducing agents (such as hydrazine, hydroquinone, and other oxygen scavengers) is known as metal passivation or metal conditioning. Although "metal passivation" refers to the direct reaction of the compound with the metal oxide and "metal conditioning" more broadly refers to the promotion of a protective surface, the two terms are frequently used interchangeably.
The reaction of hydrazine and hydroquinone, which leads to the passivation of iron-based metals, proceeds according to the following reactions:
N2H4+ 6Fe2O3®4Fe3O4+ 2H2O + N2
hydrazine hematite magnetite water nitrogen
C6H4(OH)2+3Fe2O3®2Fe3O4+C6H4O2+H2O
hydroquinone hematite magnetite benzoquinone water
Similar reactions occur with copper-based metals:
N2H4+4CuO®2Cu2O+2H2O+N2
hydrazine cupric oxide cuprous oxide water nitrogen
C6H6O2+2CuO®Cu2O+C6H4O2+H2O
hydroquinone cupric oxide cuprous oxide benzoquinone water
Magnetite and cuprous oxide form protective films on the metal surface. Because these oxides are formed under reducing conditions, removal of the dissolved oxygen from boiler feedwater and condensate promotes their formation. The effective application of oxygen scavengers indirectly leads to passivated metal surfaces and less metal oxide transport to the boiler whether or not the scavenger reacts directly with the metal surface.
Features
• Fast acting, liquid oxygen scavenger.
• Safe and easy to use, low toxicity.
• Reduces corrosion of iron and copper, increasing system life and reliability.
• Neutralises acids occurring in condensate system.
• Volatile product, provides distribution and protection throughout the boiler system, economical in use.
• Suitable for use in conjunction with combined and co-ordinated treatment programmes.
• Organic product, no dissolved solids added.
• Simple test to determine treatment level.
