Tel: 250.656.5366
Fax: 250.656.5344
Contact: [email protected]
EMCS INDUSTRIES LTD.
Unit 5 - 10114 McDonald Park Rd.
North Saanich, BC V8L 5X8
4
Many methods have been tried, but always with associated problems. Historically, chlorination has
been used as the major chemical control of bio-fouling. Government regulations have placed increasingly
severe limitations on chlorine concentrations and duration, to the extent that intermittent chlorination at
the dosages permitted is not always an effective deterrent to the settlement and growth of marine
organisms. Chemical methods produce severe corrosion problems and can cost more to operate. Methods
must be capable of controlling primary fouling organisms, have low solubility, reduce pitting, be
compatible with existing equipment, and present no environmental hazards.
MARELCO™
meets these requirements by slowly dissolving special alloyed anodes into electrolytic
products (less than 10 mg/litre) which creates a environment hostile to primary forms of marine fouling
while at the same time reducing corrosion.
Impressed direct constant current is applied to the anodes, generating aluminum hydroxide from the
trap corrosion anode and copper ions into solution from the marine growth anode. Aluminum hydroxide
suspends the released copper, and being highly gelatinous spreads out into the slower moving areas of
the sea chests, where marine growth larvae are most likely to settle. Treatment is concentrated at the
inlet areas before water enters the various services. Sea water moving past the anodes acts as the mixing
agent, and the motive force to carry the suspension throughout the system.
Not only does the trap corrosion anode produce the colloidal suspension, it also actuates a corrosion
cell that protects the cathode from adverse reaction to copper. This dual system guarantees the
elimination of marine growth, reduction of corrosion, elimination of pitting, and is environmentally safe.
(ii)
Corrosion Protection
Total corrosion prevention is rarely achieved, although it can be in specific instances. The concept of
corrosion control includes a broad spectrum of techniques ranging from acceptance of a finite life to some
quantitative diminution of the rate of attack, for example, in inhibited cooling water systems.
MARELCO™
inhibits corrosion in water cooling systems by an electrochemical and barrier film
technique. The system produces a tiny, corrosion resistant and sacrificial film between the metal and its
environment. The trap corrosion anode creates ionic products which form a gelatinous alkaline coating
on the pipe surface or structure (the cathode) inhibiting corrosion up to 85% in a complete corrosion
protection system with the installation of treatment tanks. In practice, the pipe looks as if its internal
surface is coated.
Summary of Contents for NOXX MARELCO
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