Summary of PhD dissertation theoretical Chemistry and Physical chemistry: Studying the effects of some additives on the alkaline non-cyanide galvanizing process, orienting the fabrication of the additive system for alkaline non-cyanide zinc plating bath

Determining the effect of the single additive being organic and inorganic substances such as poly alcohol, poly amines, sodium salt of various modules and the combination of additives on the properties of the zinc coating created in the solution. alkaline plating solution without cyanide, compare the chemical and physical properties of the coating obtained from the non cyanide alkaline plating bath and other plating baths. Since then, an additive system can be used in alkaline zinc-plated tanks without cyanide.
Nội dung trích xuất từ tài liệu:
Summary of PhD dissertation theoretical Chemistry and Physical chemistry: Studying the effects of some additives on the alkaline non-cyanide galvanizing process, orienting the fabrication of the additive system for alkaline non-cyanide zinc plating bath 1 MINISTRY VIET NAM ACADEMY OF EDUCATION AND TRAINING OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ---------------------------- TRUONG THI NAM Thesis title: STUDYING THE EFFECTS OF SOME ADDITIVES ON THE ZINC PLATING PROCESS, ORIENTED APPLICATION FOR ALKALINE NON-CYANIDE ZINC PLATING BATH SUMMARY OF PHD DISSERTATION Major: Theoretical Chemistry and Physical Chemistry Code: 9.44.01.19 HA NOI 2021 This dissertation has been carried out at Graduate university of Science and Technology, hanoi. Viet Nam Academy of Science and Technology 2 Supervisors: Dr. Le Ba Thang Assoc. Prof. Dr. Nguyen Thi Cam Ha The thesis will be defended at the Board of Examiners of Graduate university of Science and Technology, hanoi. Viet Nam Academy of Science and Technology at …………………….. on ……………….. 1. Significance of the study 3 The problem of corrosion resistance for metal materials has become an urgent need for all countries in the world, especially for Vietnam which is located in the tropical monsoon climate: temperature, High air humidity [1]. Metal coating is one of the methods of corrosion protection that has been researched and used quite popularly in the world and in Vietnam. Among them, zinc is one of the most used metal coatings to protect components, parts, machine parts and carbon steel structures thanks to its low cost, cathodic protection for steel. . Galvanized coating can be obtained from a variety of methods such as electroplating, hot dipping, spray coating, where electroplating dominates with small details, is used in atmospheric conditions and does not require too much longevity. high. Some of the zinc plating solutions have been studied and used such as: zinc plating from sulfate solution, fluoride, cyanide, pyrophotphate, chloride and non-cyanide alkali. Among them, the solutions widely used in industry are cyanide, chloride and non-cyanide alkali. The world's cyanide alkali-plated solution was commercialized very early in the 1960s [3]. However, recently, thanks to the introduction of new polishing additive systems as well as due to environmental protection requirements, this plating tank is really interested, accepted and becomes the best solution to change. cyanide plating tank. The non-cyanide alkaline zinc plating solution has some outstanding advantages such as: more economical, non-toxic, good coating quality, easy to pass, especially suitable for passive solutions of Cr (III), good throwing power, especially easy to handle wastewater [2, 4]. The downside is more complex, which requires a good surface treatment. However, if the alkaline plating bath is free of cyanide without additives, the poor quality coating cannot be used in industry. Many organic and inorganic additives introduced at relatively low concentrations can alter zinc precipitation, coating structure, morphology, and properties. One added additive can affect many properties of the coating, but in reality many additives are still added at the same time because they need their synergy. They make the coating smooth, flat, increase throwing power, have a nice gloss, work at a wide current density [3, 5-24]. In fact, in Vietnam, to meet the additive requirements for the galvanizing process of automobile and motorcycle manufacturers, a number of additive systems have been introduced and put into production. Since the early 2000s, ENTHONE has introduced to the Vietnamese market the NCZ DIMENSION additive system, the COLOMBIA company introduced the COLZINC ACF2 system, etc. However, the applicability of these preparations is limited due to the cost. High quality has certain limitations. 4 In the country, the study of additive systems for zinc plating in general and alkali galvanizing in particular has not been given adequate attention. There is no official research result published on the effects of these factors on the zinc plating process in general and the non-cyanide alkali galvanizing process in particular, and no supplier has given an additive system. for non-cyanide alkaline galvanizing tanks. Stemming from the above domestic situation, the selection of the topic: studying the effects of some additives on the alkaline non-cyanide galvanizing process, orienting the fabrication of the additive system for alkaline non-cyanide zinc plating bath, oriented to the fabrication of the additive system for the alkaline galvanized tank Meeting the practical needs, the research direction can create a product oriented application for the domestic alkali galvanizing industry, and at the same time add insights to support the galvanizing businesses. 2. Research aims and objectives Determining the effect of the single additive being organic and inorganic substances such as poly alcohol, poly amines, sodium salt of various modules and the combination of additives on the properties of the zinc coating created in the solution. alkaline plating solution without cyanide, compare the chemical and physical properties of the coating obtained from the non cyanide alkaline plating bath and other plating baths. Since then, an additive system can be used in alkaline zinc-plated tanks without cyanide 3. Main research content 1. Investigate the effects of the single additive on the throwing power capacity, current eff ...