mbt sandalen Hot dip aluminum SUH 409L steel atmos

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Hot dip aluminum SUH 409L steel atmospheric corrosion resistance

Too slow. Stainless steel substrate development 4.1 Initial corrosion of exposed parts of the aluminum plate section near the cut end of the coating compared with the flat part of the corrosion occurred, the exposed parts of the substrate steel, it can be considered anti-corrosion coating sacrifices played a role in . Cut-side section is aluminum, sulfur corrosion of iron as the main bio-covered surface of the Al concentration in the high reason is because, early on in the exposure of the iron corrosion products, with the subsequent corrosion of the coating mix the precipitation of aluminum's sake. Therefore, the aluminum plate in the corrosive effect of the initial corrosion coating of sacrifice does not work, but the corrosion of steel substrate, then, with the formation of iron corrosion products, the occurrence of anti-corrosion coating the role of the sacrifice. SUH409L aluminum plate after the test after 10 years of exposure to exposed parts of the matrix of steel iron corrosion product was not found, this shows that the role of anti-corrosion coating sacrifices played a role, because from the early stages of corrosion of the corrosion of steel substrate is inhibited's sake . In addition, it can be considered early in the corrosion coating is difficult to sacrifice corrosion effect,[link widoczny dla zalogowanych], in the matrix exposed parts of the corrosion of steel when compared with the low carbon steel substrate superior corrosion resistance is the use of SUH409L steel, also have a inhibition of iron corrosion products generated effects. 4.2 aluminum coating corrosion inhibiting effect of corrosion products in the industrial environment or coastal environment, exposure to aluminum SUH409L l0 years after the base plate are coated steel corrosion products exposed parts covered, so to study the corrosion generated in this section material covering exposed steel parts of the matrix effect. From the aluminum plate in the coastal environment SUH409L 10 years after exposure to the polarization curve indicated that the coating: a slight decrease in corrosion potential after exposure, but the coating of the corrosion current density of 1.2 × 1OA / m,[link widoczny dla zalogowanych], roughly the current density close to the value before exposure ; from lmm away from the wide-ranging cross-section of part of the polarization curve showed that after exposure to the test piece, the cathode reaction was significantly inhibited after exposure to the corrosion current density of 1.5 × 10A / m, less than the exposure for about 1 / 33 This cross-section area after exposure to the corrosion current density after exposure to the aluminum layer and the corrosion current density of roughly the same; using SVET measured cross-section of the Department of aluminum plate SUH409L current density distribution around the show: the test piece before exposure cross-section area of the cathode current detection, the coating around the anode current detection. This shows that exposed parts of the substrate steel, the coating has played a role in corrosion. 10 years in the marine environment after exposure to the specimens cross-section not found concentrated in parts of the cathode current, cross-section of coating and the surrounding area is dotted with about the same anode current density. In addition, in industrial environments exposed to test materials for 10 years has also been confirmed that the same result. The electrochemical measurement results show that once the aluminum layer of corrosion products deposited on the cross as a part of it will hinder the film, resulting in inhibition of cross-section area of the cathodic reaction is reduction of dissolved oxygen. Steel and aluminum SUH409L coating of steel corrosion products on exposed parts of the matrix accumulation, inhibit the cathodic reaction,[link widoczny dla zalogowanych], so near the coating to significantly reduce the corrosion rate, generally reach the flat part of the corrosion rate of coating the same level, so that in the long period of time exposed parts of the substrate near the coating of steel will be retained. In short, the aluminum SUH409L steel plate in the exposed parts of the matrix aluminum plate with a more than excellent corrosion resistance, resistance to atmospheric corrosion. This is due to the effects of three complementary Suozhi: ① to improve the matrix effect of the corrosion resistance of steel itself, ② aluminum coated with a sacrifice corrosion effect, ③ aluminum layer inhibited the accumulation of corrosion products cathodic reaction effect. 5 Conclusion In the industrial environment and coastal environment using aluminum SUH409L steel plate exposure test for 10 years, investigated the corrosion behavior of the atmosphere, get the following results. (1) aluminum SUH409L steel in the industrial environment or coastal environment, its location and cut the flat end of the sample matrix of cross-section area of steel exposed red rust does not occur, does not occur and the substrate steel. (2) l0 years after exposure to aluminum SUH409L exposed steel parts of the matrix of steel,[link widoczny dla zalogowanych], with aluminum, sulfur, oxygen as the main non-crystalline corrosion product accumulation. Ministry of the matrix near the exposed steel, the corrosion of aluminum coating on the same site than the aluminum plate light, a wide range of coating remaining. (3) cross-section of aluminized steel SUH409L polarization around the site and the SVET measurement test showed that the matrix in the initial stage of corrosion of steel exposed parts of the cathode current focus, play the role of anti-corrosion coating effect of the sacrifice,[link widoczny dla zalogowanych], but the exposed parts of the substrate steel, Once the coating of the corrosion product accumulation, the matrix of steel exposed parts of the cathodic reaction will be significantly inhibited. Compiled from the \I 1
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