What are the material factors that affect the corrosion of seamless scaffolding points?
(1) Alloy composition for seamless scaffolding, 0, 10 and F and other elements are the alloy with good corrosion resistance to the main alloy elements. Other elements may also have some effect, while elements such as K reduce the resistance of seamless scaffolding to point corrosion. It is certain that the effect of alloy elements on the corrosion resistance of the material is summarized briefly in favour of the effect. The effects of 13 and 0 are changing. 3 is beneficial in solid solution, but harmful when it is presumed as intermediate metal phase, 0 is harmless in solid solution, and harmful when extracted from carbides, but slightly adversely affected.

(2) The results of cold processing of the seamless scaffolding of austry show that the number of pits on the surface of the sample after cold processing increased and the size of the pits beted beed smaller. This is because cold processing increases the density of misplacement, misalmed at the surface outcrob is easy to cause point corrosion pits, cold processing has the tendency to increase point corrosion.

(3) The surface state of a given alloy environmental system, the factor that determines the corrosionity of alloy point is the finish of the surface of the material. In fact, it makes no sense to compare the tendency of alloys with different surface finishes to do some corrosion. The effect of surface finish on the corrosion performance of seamless scaffolding points is shown in the figure. It shows that in the same material environment system, if the surface finish is different, the difference in point corrosion prody can be more than 14.

4) Seamless scaffolding in the air, oxides formed by heating may have a significant impact on point corrosion performance. The thermal galvanized scaffolding of microscopic tissue plays an important role in the corrosion resistance of alloys. Various phases, such as sulphides, 3 ferrides. Phases, sensitive crystal boundaries, welds, etc. can have a decisive impact on the corrosion resistance of steel, they are the most sensitive areas of point corrosion. Point corrosion is more closely related to compositional phases for the casting seamless scaffolding of microscopic tissue and for Mars-type seamless scaffolding, where microsomes are sensitive to heat treatment processes. It should be pointed out that the compound manganese sulfide inclusion is a more sensitive part of point corrosion. Therefore, aluminum deoxygenation agents should be avoided when smelting seamless scaffolding.

(5) The oxidation film produced by welding may be detrimental to the corrosion resistance of the alloy in the solution of strong chloride.

(6) The main role of passivation treatment is to dissolve the seamless scaffolding surface of the debris and contamination, so that it is clean, it can also remove the surface of manganese sulfide, this mix may become the germ of point corrosion, thereby improving the seamless scaffolding corrosion resistance. It is important to note that seamless scaffolding is cleaned with a sodium hydroxide solution after passivation treatment