Corrosion crisis: why are your pex fittings tarnishing? uncover the startling truth!
What To Know
- This blog post aims to shed light on the potential causes of PEX fittings corrosion and provide practical solutions to prevent or mitigate this issue.
- Oxygen can also contribute to PEX fittings corrosion, particularly in systems with fluctuating water pressure or where the fittings are exposed to air.
- Chlorine exposure is the leading cause of PEX fittings corrosion, especially in areas with high chlorine levels or where chloramines are used.
PEX (cross-linked polyethylene) fittings have gained widespread popularity as an alternative to traditional copper plumbing due to their durability, flexibility, and ease of installation. However, in some instances, PEX fittings may exhibit corrosion, raising concerns among homeowners. This blog post aims to shed light on the potential causes of PEX fittings corrosion and provide practical solutions to prevent or mitigate this issue.
Understanding PEX Corrosion
Corrosion is a chemical process that degrades the surface of a metal or plastic material. In the case of PEX fittings, corrosion can manifest as discoloration, pitting, or cracking. It can weaken the fittings, reduce their lifespan, and compromise the integrity of the plumbing system.
Common Causes of PEX Fittings Corrosion
1. Chlorine Exposure
Chlorine, a common disinfectant used in municipal water supplies, can react with the brass inserts within PEX fittings, leading to corrosion. This is especially prevalent in areas with high chlorine levels or where the water has been treated with chloramines (a combination of chlorine and ammonia).
2. Oxygen Exposure
Oxygen can also contribute to PEX fittings corrosion, particularly in systems with fluctuating water pressure or where the fittings are exposed to air. When oxygen dissolves in water, it can form corrosive compounds that attack the metal components of the fittings.
3. Improper Installation
Incorrect installation techniques, such as overtightening or using incompatible materials, can damage the PEX fittings and create entry points for corrosive substances. For instance, using steel or galvanized pipe clamps on PEX fittings can promote galvanic corrosion due to the dissimilar metals.
4. Low-Quality Fittings
Inferior-quality PEX fittings made with substandard materials or poor manufacturing processes may be more susceptible to corrosion. These fittings may not meet industry standards and may not provide adequate protection against corrosive elements.
5. Galvanic Corrosion
When dissimilar metals are in contact with each other in the presence of an electrolyte (such as water), galvanic corrosion can occur. In a PEX system, this can happen if brass fittings are connected to copper or galvanized pipes. The more reactive metal (brass) will corrode to protect the more noble metal (copper).
Prevention and Mitigation Strategies
1. Choose High-Quality Fittings
Opt for PEX fittings that are certified by reputable organizations and meet industry standards. These fittings are designed to resist corrosion and ensure long-term durability.
2. Control Chlorine Levels
If your water supply contains high levels of chlorine, consider installing a water filtration system to reduce chlorine exposure. This will help protect the PEX fittings and other plumbing components.
3. Minimize Oxygen Exposure
Install PEX fittings in a way that minimizes their exposure to oxygen. Avoid using exposed PEX fittings in areas where water pressure fluctuates or where the fittings may be subjected to air.
4. Use Compatible Materials
Ensure that all materials used in the plumbing system are compatible with PEX fittings. Avoid using dissimilar metals or incompatible pipe clamps that can promote galvanic corrosion.
5. Install Properly
Follow manufacturer’s instructions carefully when installing PEX fittings. Avoid overtightening or using excessive force, as this can damage the fittings and compromise their integrity.
6. Inspect Regularly
Regularly inspect PEX fittings for signs of corrosion, such as discoloration, pitting, or cracking. If corrosion is detected, replace the affected fittings promptly to prevent further damage to the plumbing system.
What You Need to Learn
Q: What are the signs of PEX fittings corrosion?
A: Corrosion can manifest as discoloration, pitting, or cracking of the fittings.
Q: What is the most common cause of PEX fittings corrosion?
A: Chlorine exposure is the leading cause of PEX fittings corrosion, especially in areas with high chlorine levels or where chloramines are used.
Q: Can I prevent PEX fittings from corroding?
A: Yes, you can prevent corrosion by choosing high-quality fittings, minimizing chlorine exposure, installing fittings properly, and using compatible materials.
Q: What should I do if I find corrosion on my PEX fittings?
A: If corrosion is detected, replace the affected fittings promptly to prevent further damage to the plumbing system.
Q: Is PEX fittings corrosion dangerous?
A: Corrosion can weaken the fittings and reduce their lifespan, potentially compromising the integrity of the plumbing system. If left unchecked, it can lead to leaks and water damage.
