Anti-corrosion protection of structures

/ Corrosion protection

Corrosion protection: ensuring product reliability and safety

In the production of mounting systems for photovoltaic installations, Kraft Solergy uses steel produced by Borcelik (Turkey), which is covered with a protective layer of zinc applied by the continuous hot-dip galvanizing process. Continuous hot-dip galvanizing produces a more uniform and durable zinc coating compared to batch hot-dip galvanizing. This provides a high degree of corrosion protection, which helps to maintain the quality of metal structures and extend their service life, especially in aggressive environments or external influences.

The mechanism of action of the protective coating applied by hot-dip galvanizing

1. Barrier protection. During hot-dip galvanizing, the metal surface is covered with a layer of zinc, which creates a barrier between the metal and the external environment. This layer forms a mechanical barrier that prevents the penetration of moisture, oxygen and aggressive substances to the metal, which avoids contact of the surface with potential corrosion factors.
2. Electrochemical protection. Zinc has a higher electrochemical potential than steel. Therefore, when a steel surface is coated with a zinc layer, zinc acts as an anode and metal as a cathode in a galvanic couple. This creates a galvanic effect where the zinc is sacrificed and gradually corrodes instead of the structural steel core. This effect is called cathodic protection or cathodic reaction, and it helps to reduce the corrosion rate of the base metal.

Anti-corrosion protection test results

Bolcelik, the manufacturer of the metal used in the structures manufactured by Kraft Solergy Company, conducted laboratory and field tests of the zinc protective layer for resistance to various types of impact.

Key points to note

On pages 11-13, we present the results of field tests in which samples of metal products were placed in an aggressive environment, namely on the seashore, where the humid air is saturated with salts. The tests were conducted for 3.5 years. The photo clearly shows that the structure of the zinc coating from Borcelik has hardly changed during this time, while other samples have visible degradation of the zinc layer.

The next test (pp. 13-14) was conducted in a laboratory. The metal products were placed in a salt room, which significantly accelerates the corrosion process. The results are visible to the naked eye.

The next test (pp. 17-22) was also conducted in a salt room to test the corrosion protection of exposed metal areas that are formed when a part of the product is cut off or holes are cut by cold stamping. In this case, the anode-cathodic protection is clearly visible - rust can appear on steel only after the zinc layer has completely disappeared. It should be noted that this protection does not work when cutting off a part of the product with abrasive tools, as the zinc layer is destroyed by high temperatures during the cutting process.

The photo on p. 16 - expert opinion of the Technical University of Istanbul on the suitability of Borcelik galvanized steel for use as a material for road chippers in very aggressive environments. The photo on p. 23 shows the result of the assembly test, which shows that neither the steel nor the zinc coating was damaged.

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Kraft Solergy Company

EUROPEAN SALES: 
KBS TRADING EOOD, VAT BG206935130
Address: Bulgaria, Burgas, 
PO box 8000, 10 Apostol Karamitev str., 5th floor, office 13
PRODUCTION PLANT, MIDDLE EAST AND ASIA SALES:
Kraft Solergy Yapi Malzemeleri Limited  Sirketi, Mersis Numarasi: 0589104109700001
Address: Ata Sb Mah. Gelincik Cad, AKBAŞLAR Holding Ges Depo No: 3, Gemlik / Bursa.