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换热器用材"钛"的特点

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非合金化钛,重量轻,密度4.51,能自然生成钝化保护膜(Ti2O3),且如果一旦被破坏,具有“自愈性”,故耐蚀性比不锈钢好,是适合含氯介质(Cl-浓度>200mg/L,温度≤130℃)的典型材料。在不超过120℃的海水和其他氯化物(如CaCl2)溶液中,实际上不受腐蚀。一般,可用于135℃以下的海水和165℃以下各种浓度的盐水(NaCl)。

Titanium alloy, light in weight, density of 4.51, can be naturally generated passivation protective membrane (Ti2O3) and if once destroyed, with "self-healing", so corrosion resistance than the stainless steel good is suitable for chlorine containing medium (Cl - concentration > 200 mg / L, the temperature is less than or equal to 130 DEG C) of typical materials. In seawater and other chloride (such as CaCl2) in no more than 120 degrees Celsius, in fact, it is not affected by corrosion. In general, can be used for 135 degrees Celsius below the sea water and 165 degrees Celsius below a variety of concentration of salt water (NaCl).

钛在沸点以下的有机酸(如浓硝酸、浓碳酸等)和稀碱液中,耐蚀性能也良好。

Titanium in the boiling point of the organic acids (such as concentrated nitric acid and concentrated carbonate etc.) and alkali, corrosion resistant performance is good.

钛在H2SO4、HCl、HF和王水等中的耐蚀性较差。在高温(120℃以上)的某些浓氯化物溶液(如PH>7、氯化物浓度>200mg/L的废水)中,也可能引起缝隙腐蚀或应力腐蚀。此时,换热器材料应选用钛-钯合金。

Poor corrosion resistance of titanium in H2SO4, HCl, HF and aqua regia in. In the high temperature (above 120 C) some concentrated chloride solution (such as PH > 7, chloride concentration > 200mg/L wastewater), it may also cause crevice corrosion or stress corrosion. At this time, should be the use of titanium - palladium alloy.