Boilers are widely used by industries and are characterized by producing and accumulating steam with a pressure higher than that of the atmosphere. This aspect requires great attention to avoid problems, such as explosions that can affect workers’ health.


Understand the source of the problem


The wear on some metallic materials can be observed through characteristics, such as porosity and reddish-brown color, popularly known as “rust color”

These factors arise due to corrosion and appear almost naturally, as they indicate the wear of metallic materials. In the case of boilers, corrosion must be carefully analyzed.

One reason is that this problem can form cracks and decrease the thickness of the walls of a boiler. In addition, this situation appears silently and is not identified by the equipment’s operating instruments.

It is worth mentioning that pressure switches and safety valves are not capable of preventing explosions. It is another aspect that shows the need to take initiatives to prevent corrosion in boilers.



Corrosion occurs in several circumstances. One is due to problems in water treatment and the increased presence of oxygen and dissolved carbon dioxide. This scenario causes tubes, collectors and other items to be internally corroded due to the bad deflation.

The outside of the tubes can also corrode due to the formation of vanadium salts, which, if oil is present in the fuel, act as catalysts when creating sulfuric acid from SO2.

It is important to note that atmospheric conditions are responsible for the appearance of corrosion on the outside of the boiler. This set of factors must be permanently monitored by the industrial sector to avoid problems in the future.



Know the main causes of the problem


There are three types of corrosion in boilers: alveolus, localized and pitting. Regardless of the type of problem, it is essential to check what are the factors that cause this situation.

The main reasons responsible for causing corrosion in the boilers are these:

  • Porous, complexing or chelating deposits;
  • Dissolved oxygen;
  • acidic pH;
  • Presence of copper and nickel, which cause galvanic corrosion;
  • Presence of suspended solids and hydrogen sulphide;
  • Hide-out or concealment.

It is worth mentioning that leakage currents and thermal shocks to a lesser extent can cause corrosion in the boilers. In the condensate lines, the equipment can be corroded due to the action of a series of elements, such as:

  • Ammonia;
  • Carbon dioxide;
  • Sulfur dioxide;
  • Sulphidic gas;.
  • Oxygen;
  • Steam.

In condensate lines, oxygen is the most active corrosive agent. At the same concentration level as carbon dioxide, it has a higher corrosion rate of six to ten times.

By having a broad view of the reasons that cause the problem, it becomes easier to establish what can be applied to prevent corrosion in the boilers. After all, knowledge is increasingly relevant to decision making.


Take preventive actions


Depending on the context, corrosion in boilers may be inevitable. Despite this, prevention is the best way to prevent this problem from causing serious damage.

There are several procedures that can be used to combat this process efficiently. One of them is the external treatments in the feed waters that cover the clarification of agents with appropriate equipment, which encompass some activities, such as:

  • Removal of turbidity, color and gases;
  • Removal of iron and manganese hardness;
  • Demineralization.

Another resource to prevent corrosion in boilers includes internal treatments. They are based on the chemical removal of oxygen by deaerating with hydrazine and sodium sulfate, through the neutralization of carbon dioxide.

In the case of low and medium pressure boilers, the treatments adopted are: complexometric, dispersant, mixed and precipitating (phosphate plus polyelectrolyte)

Regarding high pressure boilers, it is essential to use demineralized and condensed water recovered with the highest possible purity content. There are other internal treatments adopted in high pressure boilers, such as coordination and congruent control; and the solid zero control with caustic soda.

Logically, periodic maintenance of boilers and cleaning of equipment within the best practices are essential to prevent corrosion in boilers in a strategic and appropriate manner.

It is very important that the equipment is cleaned according to the manufacturer’s instructions. In this way, the boiler will have a longer service life and less risk of suffering from corrosion.


Make a good choice of manufacturer


In a scenario of high competitiveness and uncertainties in the economy, it is crucial to apply financial resources with common sense. Many industries need boilers to keep production running smoothly.

Therefore, it is essential that this equipment has a good performance and presents a performance within expectations. It is only possible to achieve this goal by purchasing boilers from a manufacturer that stands out for the quality of its products.

Here at Icavi you can count on a team of highly qualified professionals with experience in the development, manufacture and installation of equipment for the production of thermal energy.

We focus on developing projects that are characterized by the use of state-of-the-art technological resources with a focus on providing excellent results.


If you are looking for great standard equipment for your business, contact us via Whatsapp! We are available to help your business achieve the best result.

Other Blog

See our insights
and more related content