If a wind or solar installation doesn’t last as long as its expected 20-30 year service life, is it really a sustainable use of resources? With corrosion as a key enemy of wind and solar longevity, Cortec® reminds manufacturers and investors not only of the importance of proper materials selection during the design phase, but also of the benefits of a few simple corrosion preventative steps during shipping and maintenance.
One of the first corrosion prevention tasks is to get solar panels and wind turbines to the jobsite in like-new condition. This can be challenging when fluctuating temperatures, humidity, and even salt spray heighten the risk of corrosion during the journey. The right protective packaging can eliminate this problem.
In the case of wind-turbine components, size, rather than ESD protection, is one of the big issues. Large wind-turbine shafts, rings, and hubs often receive the brunt of attack from harsh weather because they may be transported on open truck beds or stored onsite for several years until installation is completed. Fortunately, VpCI®-126 HP UV Shrink Film and MilCorr® VpCI® Shrink Film are two anticorrosion films designed to hold up well in outdoor conditions and available in sizes large enough to shrink wrap giant components. If needed, additional protection can be added, such as VpCI®-368 D removable coating for more vulnerable surfaces and/or Desicorr® VpCI® Pouches for additional corrosion protection plus desiccant action within equipment and packaging voids.
Once solar panels and wind turbines are put into service, the job of corrosion protection is not over. Solar panels and wind turbines are inherently equipped with wires and electrical contact points that merge inside control boxes potentially subject to the ingress of oxygen, humidity, and chlorides.
Placing a small self-stick device such as the VpCI®-105 or VpCI®-111 Emitter inside is an easy and effective way to guard against corrosion surprises that would require early repair or replacement of any exposed electrical contact points within the panel. Similar to VpCI® films, these devices release corrosion inhibiting vapors that diffuse throughout the space and adsorb on metal surfaces (ferrous and non-ferrous) to which they are attracted. It is much easier to replace these once every two years as part of routine maintenance rather than risk the potential of corroded metal contacts that could interrupt operations and require more extensive repair.
In some cases, extra coatings may be desirable on various structural components. For instance, wind-turbine base bolts are especially prone to corrosion and are good candidates for VpCI®-368.
Although classified as a removable coating, VpCI®-368 offers such heavy-duty corrosion protection that it is often used in offshore platform layups. If (unlike normal) solar panel frames and supports are made of carbon steel rather than corrosion resistant aluminum or galvanized steel, an extra protective coating such as EcoShield® VpCI®-386 or a primer/topcoat combo such as VpCI®-396 and VpCI®-384 is definitely in order to reduce solar structural corrosion. In some extreme conditions, owners may even find supplementary coatings warranted for an additional layer of protection on aluminum or galvanized steel in the most severe environments. In these cases, a wash primer such as VpCI®-373 should be used before top-coating for better adhesion.
Protecting solar and wind components during transit is critical to getting off to a good start, while protecting control panels and vulnerable structural components as part of routine maintenance can promote desired longevity by reducing corrosion at some of the easiest points to address.
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