آندهای MMO

توضیحات

Mixed Metal Oxide Anode (MMO)

Mixed metal oxide anodes or MMO anodes consist of two parts, the
underlayer and the mixed metal oxide coatings. Titanium It has been chosen
as the substrate, because this metal has the necessary properties to receive a
coating to deal with aggressive chemical environments has and is a suitable
conductor for the passage of current.
Another advantage of titanium compared to other metals is to use it as a
substrate for MMO anodes. It is in different forms such as: net-shaped, tubular,
strip, wire and plate. Mixed metal oxide coatings on metal The substrate
(titanium) covers the MMO anodes, it is a few microns and very thin, which is
different on the metal below. layer (titanium) is applied. The coating used in
MMO anodes is determined according to the type of use, which consists of Its
donor can be a combination of two or more metal oxides including iridium,
tantalum, ruthenium and titanium oxides
The applied coating performed the function of activation, so that the
additional potential for the release of chlorine and anodic oxygen can be
significantly reduced and then the MMO anode catalytic coating creates a
small resistance for the anode that this low resistance It reduces the
corrosion rate of MMO anodes according to their lifespan. The consumption
rate of MMO anodes is very low and numerical It is less than 1 Year.A/mg,
which depends on the environmental conditions and their application.

MMO anodes in different electrolytes have different current density and life as
described in the table below Is:

Today, MMO anodes are widely used in cathodic systems for the following reasons:
o Production of MMO anodes in different types and sizes for their use in different
cathodic systems
• Easy to use
• High output current density
• Light weight and easy to transport
• Stability in maintaining dimensions (dimensional stability) due to the use of DSA
(Anode Dimensionally Stable) technology
• Recoating if the original coating is lost
• Has a long life in high current density
The use of MMO anodes in the permanent cathodic protection system (current
application) to protect metal structures buried in the soil or Drowning in water is
common. MMO anodes can be used in the cathodic protection system to protect
buried structures soil such as: Piping & Pipeline (transfer of oil, gas, etc.), External
cathodic protection system (bottom of tanks) and Internal (walls and internal floors
of tanks) are marine and concrete structures
1- Tubular anodes (Tubular MMO) Anode Tubular Oxide Metal Mixed or tubular
MMO for cathodic protection of structures buried in the soil Immersion in
water is used in two ways:
1. Tubular MMO anode with carbon backfill
2. Anode MMO tube directly without backfill or carbon back strap

Anode Tubular Oxide Metal Mixed or tubular MMO based on the size and type of
environment used (buried in). soil or immersed in water) have different output
currents and lifetimes, which are given in the following table:

It should be noted that the titanium sublayer of Tubular Anode Oxide Metal Mixed
anodes conforms to the ASTM B338 standard. 2 or 1 Grade is considered

آند MMO چیست؟

MMO مخفف عبارت Mixed Metal Oxides و به معنای ترکیبی از اکسید فلزات است. آندهای MMO روکش هایی هستند که از اکسیدهای فلزاتی نظیر تایتانیوم، ایریدیوم، روتنیوم و تانتالوم تولید می شوند. قابل ذکر است که آند MMO در روش های حفاظت کاتدی مورد استفاده قرار می گیرد.

آندهای MMO از دو بخش فلز پایه و پوشش تشکیل شده‌اند. از تیتانیم به عنوان فلز پایه استفاده شده زیرا این فلز خواص مورد نیاز جهت دریافت پوشش به منظور مقابله با محیط‌های شیمیایی مهاجم را داشته و برای انتقال جریان مناسب می‌باشد.

از دیگر مزایای تیتانیم می‌توان به سبکی و استفاده از آن در شکل‌های مختلفی از جمله لوله، نوار، سیم، توری و صفحه اشاره نمود.