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无缝方矩管腐蚀的材料因素?

来源:http://www.jnlhjscl.com/ 日期:2020-11-20 发布人:adminlehao

影响无缝方矩管点腐蚀的材料因素都有哪些。

What are the material factors that affect the pitting corrosion of seamless rectangular tubes.
(1)合金成分对无缝方矩管来说,0、10及F等元素是使合金具有良好抗点腐蚀性能的主要合金元素。其他一些元素也可能有一定的效果,K等元素则会降低无缝方矩管的抗点腐蚀能力。将合金元素对材料耐点腐蚀性的影响扼要地概括于有利影响是肯定的。13、0的影响是变化的。3在固溶体中是有益的,但当作为中间金属相析出时则有害,0在固溶体中是无害的,当以碳化物析出时则有害,但稍有不利影响。
(1) For seamless rectangular tube, 0, 10 and F are the main alloy elements which make the alloy have good pitting corrosion resistance. Some other elements may also have certain effect, while K and other elements will reduce the pitting corrosion resistance of seamless rectangular tubes. It is certain that the effect of alloying elements on the point corrosion resistance of materials can be summarized as favorable effects. 13. The effect of 0 is variable. 3 is beneficial in solid solution, but harmful when it is precipitated as intermediate metal phase, 0 is harmless in solid solution, and harmful when precipitated as carbide, but it has slightly adverse effect.
(2)对奥氏体无缝方矩管进行冷加工的研究表明,冷加工后试样表面的蚀坑数目增多和蚀坑的尺寸变小。这是因为冷加工增加位错密度,位错在表面露头处容易引起点腐蚀坑,冷加工有增加点腐蚀的趋势。
(2) The study on cold working of austenitic seamless rectangular tube shows that the number of etch pits on the surface of specimens increases and the size of pits decreases after cold working. The reason is that the density of dislocations is increased by cold working, and the pitting corrosion pits are easily caused by dislocations at the surface outcrop.
                                    济南方矩管
(3)表面状态对一个给定的合金环境体系,决定合金点腐蚀电位的因素乃是材料表面的光洁度。事实上,对具有不同表面光洁度的合金进行点腐蚀倾向的比较是毫无意义的。关于表面光洁度对无缝方矩管点腐蚀性能影响情况如图所示。它表明,在同样的材料环境体系中,若表面光洁度不同,其点腐蚀电位的差别可在14以上。
(3) For a given alloy environment system, the factor that determines the spot corrosion potential of the alloy is the surface finish of the material. In fact, there is no point in comparing the surface finish of the alloy. The effect of surface finish on the pitting corrosion performance of seamless rectangular tube is shown in the figure. It shows that in the same material environment system, if the surface finish is different, the difference of point corrosion potential can be more than 14.
(4)无缝方矩管在空气中,由于加热而形成的氧化物可能对抗点腐蚀性能有重大影响。由
(4) The oxide formed by heating may have a significant effect on the pitting corrosion resistance of seamless rectangular tube in air. from
显微组织热镀锌方管对合金抗点腐蚀性能起着重要作用。各种相,如硫化物夹杂、3铁素体。相、敏化的晶界以及焊缝等都可能对钢的抗点腐蚀性能具有决定性的影响,它们都是发生点腐蚀敏感的部位。这对显微组织较为复杂的铸造无缝方矩管以及显微组织对热处理工艺十分敏感的马氏体型无缝方矩管来说,点腐蚀与组成相的关系就更为密切。需要指出的是,含的复合硫化锰夹杂是点腐蚀更敏感的部位。因此,在冶炼无缝方矩管时,应避免采用铝脱氧剂。
The microstructure of hot-dip galvanized square tube plays an important role in the pitting corrosion resistance of the alloy. Various phases, such as sulfide inclusions, 3 ferrite. The phase, the sensitized grain boundary and the weld may have a decisive influence on the pitting corrosion resistance of the steel. They are all sensitive parts of pitting corrosion. The relationship between pitting corrosion and phase composition is more close for casting seamless rectangular tube with complex microstructure and martensitic seamless rectangular tube whose microstructure is very sensitive to heat treatment process. It should be pointed out that the composite manganese sulfide inclusions are more sensitive to pitting corrosion. Therefore, aluminum deoxidizer should be avoided in smelting seamless rectangular tube.
(5)焊接所产生的氧化膜对合金在烈性氯化物溶液中的抗点腐蚀性能可能是不利的。
(5) The oxidation film produced by welding may be detrimental to the pitting corrosion resistance of the alloy in strong chloride solution.
(6)钝化处理的主要作用是溶解无缝方矩管表面的夹杂物和沾染物,使之洁净,它还可去掉表面的硫化锰夹杂,这种夹杂可能成为点腐蚀的萌生源、从而改善无缝方矩管的抗点腐蚀性能。
(6) The main function of passivation treatment is to dissolve the inclusions and contaminants on the surface of seamless rectangular tube to make it clean. It can also remove the manganese sulfide inclusion on the surface, which may become the source of pitting corrosion and improve the pitting corrosion resistance of seamless rectangular tube.



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