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不锈钢发作锈蚀的原因

不锈钢发作锈蚀的原因
Causes of rust attack on stainless steel
不锈钢不简单生锈与不锈钢的成分有很大的联络。不锈钢的成分中除了铁外,还有铬、镍、铝、硅等。一般的不锈钢含铬量一般不低于12%,高的乃至到达18%。钢中参加铬等元素后,就能改动钢的功能,如例钢的分子结构更均匀,在钢的外表更易生成一层致密的氧化物保护膜等,然后大大提高不锈钢耐腐蚀的才能。所以不锈钢能反抗火、水、酸、碱和各种溶液对它的腐蚀,不生锈。科学家发现,钢的内部结构越均匀,各种组成成分就联络得越严密,腐蚀物侵略就越困难,再加上外表又附着一层氧化物保护膜,就像给钢铁穿上盔甲相同,自然就不简单生锈了。可是不锈钢也会生锈。
Stainless steel is not simple rust and has a lot of contact with stainless steel components. In addition to iron, stainless steel contains chromium, nickel, aluminum, silicon and so on. The chromium content of stainless steel in general is not less than 12%, high or even 18%. When chromium and other elements are added to the steel, the function of the steel can be changed, for example, the molecule structure of the example steel is more uniform, and a dense oxide protective film is easily formed on the surface of the steel, which greatly improves the corrosion resistance of the stainless steel. So stainless steel can resist fire, water, acid, alkali and corrosion of various solutions to it, without rust. Scientists have found that the more uniform the steel's internal structure, the more closely the various components are linked, the more difficult it is to invade the corrosive material, and the more oxide-coated the surface, just like putting armor on the steel, the less rusty it is. But stainless steel also rusts.
不锈钢是靠其外表构成的一层极薄而巩固细密的稳定的富铬氧化膜(防护膜),避免氧原子的持续进入、持续氧化,而取得抗锈蚀的才能。一旦有某种原因,这种薄膜遭到了不断地破坏,空气或液体中氧原子就会不断进入或金属中铁原子不断地析离出来,构成疏松的氧化铁,金属外表也就遭到不断地锈蚀。这种外表膜遭到破坏的方式很多,日常生活中多见的有如下几种:

Stainless steel is a very thin and stable chromium-rich oxide film (protective film) formed by its appearance, which can prevent oxygen atoms from continuously entering and oxidizing, and obtain the ability to resist corrosion. Once for some reason, the film is constantly destroyed, oxygen atoms in the air or liquid will continue to enter or iron atoms in the metal will continue to separate out, forming a loose iron oxide, metal surface will be constantly corroded. There are many ways to destroy the outer membrane.

工程机械油漆

1.不锈钢外表存积着含有其他金属元素的粉尘或异类金属颗粒的附着物,在湿润的空气中,附着物与不锈钢间的冷凝水,将二者连成一个微电池,引发了电化学反响,保护膜遭到破坏,称之谓电化学腐蚀。
1. The stainless steel surface contains dust containing other metal elements or heterogeneous metal particles of the attachment, in the humid air, the attachment and the condensate between stainless steel, the two connected into a micro-battery, triggered the electrochemical reaction, the protective film was damaged, known as electrochemical corrosion.
2.不锈钢外表粘附有机物汁液(如瓜菜、面汤、痰等),在有水氧情况下,构成有机酸,长期则有机酸对金属外表的腐蚀。
2. The stainless steel surface is adhered with organic juice (such as melon, vegetable, noodle soup, phlegm, etc.), in the presence of water and oxygen, organic acids form, long-term corrosion of the metal surface organic acids.
3.不锈钢外表粘附含有酸、碱、盐类物质(如装饰墙壁的碱水、石灰水喷溅),引起部分腐蚀。
3. The stainless steel surface contains acid, alkali and salt substances (such as alkaline water and lime water splashing on decorative walls) which cause partial corrosion.
4.在有污染的空气中(如含有大量硫化物、氧化碳、氧化氮的大气),遇冷凝水,构成硫酸、硝酸、醋酸液点,引起化学腐蚀。
4. In the polluted air (such as atmosphere containing a large number of sulfides, carbon monoxide, nitric oxide), when encountering condensate, it forms sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
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