今天小编为各位讲解一下影响无缝方管点腐蚀的材料因素都有哪些。合金（jīn）成分对无缝方管来（lái）说，0、10及F等元素是使合金具有良好抗点（diǎn）腐蚀性能的主要合金元素。其他一些（xiē）元素也（yě）可能有一（yī）定的效果，K等元素则会降低无缝方管的抗点腐蚀能力。将合金元素对材（cái）料耐点腐蚀（shí）性的影响（xiǎng）扼要地概括于有利影响是肯定的。13、0的影响是变（biàn）化（huà）的。3在固溶体中是有益的，但当作为中间（jiān）金属相析（xī）出（chū）时则有害，0在固溶体中是无害的，当以碳化物析出时则有（yǒu）害，但（dàn）稍有不利影响。
Today, Xiaobian will explain to you the material factors that affect the pitting corrosion of seamless square pipes. For seamless square tubes, elements 0, 10 and F are the main alloying elements which make the alloy have good resistance to pitting corrosion. Other elements may also have some effect, while K and other elements will reduce the pitting corrosion resistance of seamless square tubes. It is affirmative that the effect of alloying elements on the pit corrosion resistance of materials can be summarized briefly in terms of beneficial effects. The effects of 13 and 0 are variable. 3 is beneficial in solid solution, but harmful when precipitated as intermediate metal phase, 0 is harmless in solid solution and harmful when precipitated with carbide, but slightly harmful. (2)对奥氏体无缝方管进行冷加工的研究表明，冷加工后试样表面的（de）蚀坑数目增多和蚀坑的尺寸变（biàn）小（xiǎo）。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（kēng），冷加（jiā）工（gōng）有增加点（diǎn）腐蚀（shí）的趋势。
(2) The research on cold-working of austenitic seamless square tubes shows that the number of pits on the surface of samples increases and the size of pits decreases after cold-working. This is due to the increase of dislocations density in cold processing, dislocations in the surface outcrop is prone to cause pitting corrosion, cold processing has the trend of increasing pitting corrosion.
(3)表面状态（tài）对一个给定的合金环境体系，决定（dìng）合金点腐（fǔ）蚀电位的因（yīn）素乃是材（cái）料表面的光洁度。事实上，对具有不（bú）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（féng）方管点腐蚀性能影响情况如图所示。它表明，在同样（yàng）的材料环境（jìng）体系中，若表面（miàn）光洁度不同，其（qí）点腐蚀电位的差别可在14以上（shàng）。
(3) For a given alloy environment system, the factor that determines the pitting corrosion potential of the alloy is the smoothness of the material surface. In fact, it is meaningless to compare the pitting corrosion tendency of alloys with different surface finish. The effect of surface finish on the corrosion resistance of seamless square pipes is shown in the figure. It shows that in the same material environment system, if the surface finish is different, the difference of pitting corrosion potential can be more than 14.
(4)无缝方管在空气中，由于加热而形成的氧化物可能（néng）对抗点腐蚀性（xìng）能有重大影响。由
(4) The oxide formed by heating in seamless square tubes in air may have a significant impact on the pitting corrosion resistance. from
显微组织热镀锌方管对合金抗点腐蚀性能起着重（chóng）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（duì）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最敏感的部位（wèi）。这对显微组织较为复杂（zá）的铸（zhù）造无缝方管以及显微组织对热（rè）处（chù）理工艺十分敏感的马氏体型无缝方管来说，点腐蚀与组成相的（de）关系就更为密切。需要指出（chū）的是，含的（de）复合硫化锰夹杂（zá）是点腐蚀更敏感的部位。因此，在冶炼无缝方管时，应（yīng）避免采用铝脱氧剂。
Microstructure galvanized square tubes play an important role in the pitting corrosion resistance of the alloy. Various phases, such as sulphide inclusions and 3 ferrite. Phases, sensitized grain boundaries and welds may have a decisive impact on the pit corrosion resistance of steel. They are the most sensitive sites for pit corrosion. For the cast seamless square tubes with complex microstructures and martensitic seamless square tubes with sensitive microstructures to heat treatment process, the relationship between pitting corrosion and constituent phases is more close. It should be pointed out that the complex manganese sulfide inclusions are more sensitive to pitting corrosion. Therefore, aluminium deoxidizer should be avoided in the smelting of seamless square tubes.
(5)焊接所产生的氧化膜（mó）对合金在（zài）烈性氯化物溶液中（zhōng）的抗点腐蚀性能可（kě）能是不利的。
(5) The oxide film produced by welding may be detrimental to the pitting corrosion resistance of the alloy in the strong chloride solution.
(6)钝化处理的主要作用是溶解无（wú）缝（féng）方管表面的夹杂物（wù）和沾染物，使之洁净，它（tā）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（méng）生源、从而改善无缝方管的抗点腐蚀性能。需要注意的是，无缝（féng）方管在钝化处（chù）理后应用氢氧化（huà）钠溶液清洗
(6) The main function of passivation treatment is to dissolve the inclusions and contaminants on the surface of seamless square tubes and make them clean. It can also remove the manganese sulfide inclusions on the surface. Such inclusions may become the origin of pitting corrosion and thus improve the pitting corrosion resistance of seamless square tubes. It should be noted that seamless square tubes are cleaned with sodium hydroxide solution after passivation treatment.
