Dongguan aluminum profile pitting corrosion, also known as hole corrosion, is a very localized corrosion pattern that produces needle-like, point-like, and hole-like shapes on metal. Pitting corrosion is a unique form of anode reaction and is an autocatalytic process. According to the manufacturers of aluminum profile connectors, pitting of aluminum can occur in the atmosphere, fresh water, or neutral aqueous solutions, and severely can cause perforations, but corrosion holes may eventually stop developing and the amount of corrosion will remain at a limit.
The pitting corrosion of Dongguan aluminum profiles is related to dielectric alloys such as chloride ions and fluoride ions to the limit. There must also be substances that promote the cathode reaction, such as dissolved oxygen in aqueous solutions, copper ions, and the like. According to the manufacturers of aluminum profile connectors, from the perspective of industrial aluminum profiles and aluminum alloys, high-purity aluminum in aluminum profiles is generally difficult to cause pitting corrosion, and pitting corrosion of aluminum alloys containing copper is the most obvious.
Galvanic corrosion is also a characteristic corrosion form of aluminum. The natural potential of aluminum is very negative. When aluminum is in contact with other metals, aluminum is always at the anode to accelerate corrosion. Galvanic corrosion is also called bimetal corrosion. The severity of corrosion is determined by the relative position of the two metal potential sequences. The greater their potential difference, the more severe the galvanic corrosion, and galvanic corrosion cannot be avoided in almost all aluminum alloys.
Gap corrosion, there is a gap when the industrial aluminum profile aluminum itself or aluminum is in contact with the surface of other materials. Due to the difference in the role of the inflatable battery, the corrosion in the gap accelerates, but there is no effect outside the gap. Crevice corrosion has little to do with alloy type, and even very corrosion-resistant alloys can produce crevice corrosion. According to the analysis of aluminum profile connector manufacturers, in recent years, there has been a more in-depth study of the mechanism of crevice corrosion. The acidic environment at the top of the crevice is the driving force for corrosion. Sub-sediment corrosion is a form of crevice corrosion.