black film phosphating of steel

Title: black film phosphating of steelAuthor: Wang XiaohuaDegree-granting units: Liaoning Normal UniversityKeywords: black film phosphating;; the temperature of zinc - manganese;; sub-step;; prepreg black approachSummary:Phosphate processing technology has been one hundred years of history, has made many new modern achievements. Industrial applications, especially in the field of phosphate greatly expanded, making it a steel processing, preservation, decoration and other important and indispensable technology, in which the black iron phosphate film is corrosion of steel and Neodymium magnets decorated as an important surface treatment .This paper summarizes the phosphating of steel modern black film development process, to arrive at three possible experimental program, and its corresponding experimental study and draw the corresponding conclusions discussed.The temperature of zinc - manganese phosphate film is black people more of a process of experimental composite stabilizer is added to improve the stability of the solution, reducing the loss of phosphate active ingredient. Rare earth salt and copper sulfate compound used to make phosphate coating successfully by the gray-black color into black. Experiment tested the film growth process Et curve, the results show that the accession of the film blackening agent greatly improved corrosion resistance.Sub-step is to study the black membrane phosphate is an important experimental methods. Experiment 2 uses the first black phosphating process after the first use of basic zinc phosphating solution for phosphate, and then the black handle. Blackening is an important factor in the decision of the film color, and hair black liquor acidity is also a decisive factor. Through different kinds of acid at different pH values ​​studied the effect of black, with phosphoric acid and acetic acid found in the joint action of black get more satisfactory results. While the process for phosphating and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php black impose the role of ultrasound can make the film adhesion can be greatly enhanced.In Experiment 3, the first black after using a phosphating process. Through literature, come summary of a viable black direct experimental methods, ie, copper - molybdenum - sulfur system. 2 at pH 1.5 conditions, the availability of uniform fine black film. Then use zinc - nickel phosphide to phosphate solution, the resulting phosphate coating on the black fill layer played a role, thereby enhancing the film's density and binding capacity, resulting in the corrosion resistance of the film greatly to improve.Degree Year: 2010