Will Iron Metal Grates Rust?

When purchasing yourself an Iron metal grate, there is always the concern on the likelihood of if the Iron will rust and corrode -- or rather a possible preventative measure to prevent this event from occurring. This blog will briefly describe key tips to help aid insight into the properties included when purchasing cast iron metal grates. Cast iron grates are exceptional for any set of circumstances which are available in a wide range of shapes and sizes. Drainage Connect's selections of Iron metal grates are durable and have multiple decorative options. Cast iron and ductile iron, like most metals, go through a natural oxidation process, which results in an outer protective coating known as “rust.” This rust layer shields the bulk iron from further oxidation. Think of rust as corroded armor that protects against additional corrosion. This property allows iron to remain strong and intact for several decades.

Over a period of time cast iron develops a rich red-brown patina that protects it from corrosion. This patina can re-develop even if the original layer is worn, chipped, or scratched. Unlike steel, cast iron and ductile iron are durable and will not flake. Once the oxidation process has begun, cast iron and ductile iron will first turn bright orange and after a few months fade to a chocolate brown, similar to the color of manhole covers.

“Preventing” Rust

Iron metal grates encounter several factors that influence the endurance and longevity of grates. Iron metal grates within a building may experience a longer life without vulnerabilities caused by the elements that would mostly occur if installed outside. Although those same exact grates could experience increased deterioration caused by drainage runoff inside that could involve harsh chemicals. Another consideration that should be mentioned -- is the Iron metals grate’s exposure to regional and environmental conditions with the surrounding varying rainfall volume. Iron Metal grates that are installed in coastal areas may see an increased transformation rate due to their constant contact with salt water.

The two conditions that cause iron to rust are:

• Moisture
• Oxygen

The three factors that accelerate rusting are:

• Carbon Dioxide
• Acids
• Impurities

Rust cannot be prevented entirely but the process can be slowed by introducing a buffer material between the iron and atmospheric oxygen and water. This can be achieved by applying linseed oil to the grates prior to installation. Another common practice is to spray paint or powder coat the metal grates. This coating must be reapplied whenever there is chipping to maintain rust protection.

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