Magnesium alloy chromium-free passivation agent
HWJ-608 无铬钝化剂 ，是由有机酸、氧化、络合剂等配制而成，广泛应用于铝铸件、铜铝结合件和铝合金的表面钝化和涂装前处理，膜层呈无色至灰色或耐蚀性好等优点。 Huiweijia HWJ-608 chromium - free passivation agent is formulated from organic acids, oxidation, complexing agents, etc., and is widely used in the surface passivation and pre-treatment of aluminum castings, copper-aluminum joints and aluminum alloys. The film is colorless to gray or has good corrosion resistance.
SEM 、 EDS 和电化学极化曲线等方法对含氟溶液中镁合金的腐蚀行为与钝化机理进行了研究。 SEM , EDS and electrochemical polarization curves were used to study the corrosion behavior and passivation mechanism of magnesium alloys in fluorine-containing solutions. : 氢氟酸与镁合金反应可达到平衡 , 平衡时镁合金表面成分比为 ( 质量比 )11.3:1 。 The results show that the reaction between hydrofluoric acid and magnesium alloy can reach equilibrium , and the surface composition ratio of magnesium alloy at equilibrium is ( mass ratio ) 11.3: 1 . , 并阻止镁合金与氢氟酸反应。 A passivation film can be formed on the surface of the magnesium alloy in the hydrofluoric acid activating solution , and prevent the magnesium alloy from reacting with the hydrofluoric acid. , 当 H2SO4/HF 积比小于 1.2 时 , 镁合金表面的钝化膜具有保护作用 ; 当 H2SO4/HF 体积比大于 1.4 时 , 镁合金基体很快被溶液腐蚀。 In a mixed solution of sulfuric acid and hydrofluoric acid , when the H2SO4 / HF product ratio is less than 1.2 , the passivation film on the surface of the magnesium alloy has a protective effect ; when the H2SO4 / HF volume ratio is greater than 1.4 , the magnesium alloy matrix is quickly corroded by the solution. , 活化后的镁合金处于钝化状态 , 不与溶液中离子发生反应。 In the nickel sulfate solution containing fluorine , the activated magnesium alloy is in a passive state and does not react with ions in the solution. , 含氟的硫酸镍溶液中添加碳酸根离子 , 镁合金基体与溶液中的镍离子发生置换反应。 However , when carbonate ions are added to the nickel sulfate solution containing fluorine , the magnesium alloy matrix reacts with the nickel ions in the solution. MgF2 只有在含氟溶液中形成具有保护作用钝化膜。 The MgF2 deposited on the surface of the magnesium alloy can only form a protective passivation film in a fluorine-containing solution.
Compared with the traditional physical sealing method, after passivation, it has the characteristics of absolutely not increasing the thickness of the workpiece and changing the color, improving the precision and added value of the product, and making the operation more convenient; because the passivation process is performed in a non-reactive state, The passivating agent can be added repeatedly, so it has a longer life and is more economical. The passivation promotes the formation of an oxygen molecular structure passivation film on the metal surface. The film is dense and stable, and has self-repairing effects in the air. Therefore, compared with the traditional method of applying antirust oil, the passivation formed by passivation The film is more stable and more resistant to corrosion. Most of the charge effects in the oxide layer are directly or indirectly related to the thermal oxidation process. 800 — 1250~C 的温度范围内，用干氧、湿氧或水汽进行的热氧化过程有三个持续的阶段，首先是环境气氛中的氧进入到已生成的氧化层中，然后氧通过二氧化硅向内部扩散，当它到达 Si02-Si 界面时就同硅发生反应，形成新的二氧化硅。 In the temperature range of 800-1250 ~ C , the thermal oxidation process using dry oxygen, wet oxygen or water vapor has three continuous stages. First, the oxygen in the ambient atmosphere enters the formed oxide layer, and then the oxygen passes through the second layer. Silicon oxide diffuses into the interior, and when it reaches the Si02-Si interface, it reacts with silicon to form new silicon dioxide. In this way, the oxygen entry-diffusion-reaction process continuously occurs, so that silicon near the interface is continuously converted into silicon dioxide, and the oxide layer grows into the silicon wafer at a certain rate.
HWJ-608 无铬钝化剂不含三价铬、六价铬、铅、镉、汞等元素，为绿色环保产品，铬化膜非常均匀 , 且耐蚀性及附着力良好，可低温下处理 . 耐腐蚀性能强，处理时间短，沉渣极少，结晶致密，槽液稳定易维护、成本低等优点， 专用于锌、镁、铝及其合金材质表面钝化处理 。 Huiweijia HWJ-608 chromium - free passivation agent does not contain trivalent chromium, hexavalent chromium, lead, cadmium, mercury and other elements. It is a green and environmentally friendly product. The chromium film is very uniform , and has good corrosion resistance and adhesion. Low temperature processing . Strong corrosion resistance, short processing time, minimal sediment, dense crystals, stable and easy maintenance of the bath, low cost, etc. It is specially used for the passivation of zinc, magnesium, aluminum and its alloy materials .
一种非常薄的、致密的、覆盖性能良好的、牢固地吸附在金属表面上的钝化膜。 The mechanism of passivation can be explained by the thin film theory, that is, the passivation is considered to be due to the interaction between the metal and oxidizing substances. During the action, a very thin, dense, good covering property is firmly adsorbed on the metal surface. Passivation film. This film exists as a separate phase, usually a metal oxide compound. It plays a role of completely separating the metal from the corrosive medium and prevents the metal from contacting the corrosive medium, so that the metal basically stops dissolving to form a passive state to prevent corrosion.
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