Boron is a nonmetallic element, boron in nature mainly exist in boric acid and borate, elemental boron has not been found.Boron can also improve themechanical properties of the steel, and improved weldability. In addition,it was pointed out that although the acid-soluble boron is not equal toeffective boron, but the acid-soluble boron with good correspondence between hardenability,for routine chemical analysis, analyze the acid-soluble boron is appropriate,but this proposal not yet been recognized, and thus the analysis of boron, is stillneed measured, the difference between the acid-insoluble boron.5%, can usewashing method to eliminate interference. Some contactamong different.Extraction method, make boron reacting withhydrofluoric acid, [BF4] – anion is formed, then adding the basic dye, such asmethylene blue, ethyl violet, brilliant green, etc. This method is simple,fast, applicable to the separation of the higher content of boron, but can notremove silicon, aluminum, molybdenum, tungsten and other elements. About the form of boron in steel, yet no unifieddivision.
There is no strictly defined in acid-solubleboron initially, but generally refers to that part of boron for aciddecomposition, due to the type of acid, concentration and heating of thedifferent ways, often make the results of the analysis of the acid-solubleboron different. Usually high-alloy steel, nickel-based superalloy containing elementssuch as niobium, tantalum, titanium, aluminum, the affinity of nitrogen is muchlarger than boron, and therefore rarely form boron nitride, the full amount ofboron can be obtained by sulfuric smoke. Acid soluble boron is mainly the solid solution ofboron, boron oxide, iron carbon boron compounds; acid insoluble boron, ismainly the boron oxide. However, ifuse boron-free glass or plastic devices instead of quartz vessel, also canobtained the same separation effect.
The disadvantage isthat when the total amount of niobium, tantalum, is less than 0.According to metal powder supplier, thereare three methods to separate boron from steel, precipitation method, the sampleuse alkali melt or increase alkaline in the test solution, so that the vastmajority of iron, chromium, manganese, nickel, cobalt, titanium, copper andother interfering elements removed by precipitation, then dry the filterportion of the test solution of boron Flocked Swab production line Suppliers determination. Therefore, for the direct decomposition of the acid-insolubleboron, is still needing majority of workers continue to explore. This method is the use of boric acid withmethanol to generate trimethyl borate methanol [B (OCH3) 3], the boron andother elements to obtain efficient separation, applicable to more complexcomponents of the high-alloy steels, and various other alloys, is the currentinternational standard separation means of the method of the main.com.mhcmp.Source:http://www. The metal school is divided into effective boron and ineffectiveboron; metallography divided into boron and borides; solid melting intoacid-soluble of boron and acid insoluble boron chemical analysis. Since boron oxide has a high degree of stability, thedecomposition of the acid insoluble boron generally use sodium carbonate meltmethod.
The form of boron in steel is very complex,and the various forms of boron acid stability were different, which gives thedecomposition of boron steel and determination some difficulties. 1971 recommended that uniform provisions C (1/2H2SO4) = 5mol /l sulfuric acid (without any oxidant) dissolving the sample, the measured boronis acid soluble boron. Boron in steelmainly exists in solid solution, also can form boron nitride, boron oxide andboron iron carbon boride. Carbon steel, low-alloy steel issometimes available the full amount of boron, sometimes range between acid-solubleboron and boron.The distillation method, is boronsclassical separation methods., to generate a ternarycomplex, and then use two tetrachloroethane, benzene, chlorobenzene and other solventto extract, achieve the purpose of separation and color. Adding a small amount of boron powder in steel can increase hardenability of steel, this is borons unique role. Thus appearsin the analysis of the “acid soluble boron” and “acid insolubleboron”, full-boron distinction. The maindrawback is that the separation time is long, and need quartz ware
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