Myths and Facts: Common Causes and Prevention of Stainless Steel Corrosion in Swimming Pools

Knowing what causes stainless steel to rust in swimming pools and how to tell the difference between myths and facts can help you look after your pool equipment better. Here are some common pool stainless steel myths and insights from BROMOCO:

Chemical Imbalance in Pool Water

Corrosion of Spa Centre Whirlpool Cylinder Walls

• Myth: You can just rely on the water being clear to show that the chemical balance is good.

• Fact: Corrosion can happen even when the water looks clear. If you've got too much chlorine, not enough pH and the alkalinity is off, it can damage the protective coating on stainless steel, which can lead to rust and pitting.

Saltwater Pool

• Myth: Stainless steel is perfectly safe in salt water pools.

• Fact: Salt water is more corrosive than fresh water, especially if the protective chromium oxide layer on the stainless steel is compromised. Regular monitoring and maintenance is essential to prevent salt corrosion.

Environmental Factor

Corrosion Risks in Indoor Pool Environments

• Myth: The location of the pool seating has no effect on stainless steel corrosion.

• Fact: Swimming pools in coastal areas are more prone to corrosion due to high humidity and high salt content in the air. Even indoor pools are at risk of corrosion due to high humidity and poor ventilation.

Mechanical Damage

• Myth: Stainless steel is very hard and will not suffer mechanical damage.

• Fact: Scratches, dents and other forms of physical damage can damage the protective surface layer of stainless steel, making it more susceptible to corrosion.

Improper Cleaning Methods

• Myth: Any cleaner can be used on stainless steel.

• Fact: Corrosive chemicals and abrasive cleaning tools can damage the protective coating of stainless steel. It is important to use the proper cleaners and methods to maintain the integrity of the material.

Prevent Corrosion of Stainless Steel in Swimming Pools

Maintain Proper Chemical Balance

Regularly test and adjust the pH, chlorine and alkalinity of your pool water. Aim for a pH value between 7.2 and 7.8 (optimal range 7.4 to 7.6), a free chlorine content in the ideal range of 2.0 to 4.0 ppm, and a total alkalinity between 80 and 120 ppm.

Applying Protective Coating

Arcadia Cruise Ship Entering Harbour for BROMOCO Maintenance

Apply a protective coating or sealant designed specifically for stainless steel to enhance its corrosion resistance. These coatings provide an additional barrier against corrosive chemicals and environmental factors. BROMOCO EPC-7460A is one such protective coating designed specifically for stainless steel to provide effective and long-lasting protection in pool or marine environments. The coating has excellent chemical, abrasion and impact resistance and offers full protection against salt spray, salt mist, brine, bleach, acids and bird droppings. It is an easy-to-apply self-levelling product that creates a seamless surface. Currently, BROMOCO EPC-7460A products have been selected by luxury cruise ships such as Queen Mary 2 and Arcadia as the specified product for the restoration and protection of stainless steel components on board.