PCB circuit boards, chip bracket, power supply circuit chips in our life, although not often meet directly, but generally exists in every aspect of our daily life, from chips, memory, power supply, switch machine, server, scientific instruments, such as special products to mobile phones, computers, televisions, air conditioners, refrigerators and other household appliances, literally open an electronic product shell, you will find circuit board is near.
However, household electrical circuit boards are not the same as industrial circuit boards. The more sophisticated equipment is, the higher the density of components on the circuit board is, and the smaller the spacing between lines is. In order to prevent the failure caused by ion migration, the cleanliness of PCB board surface is required to be higher. In addition, the ion residue on the surface of the circuit board may also lead to the corrosion of the circuit board itself, shortening the service life of electrical appliances.
Because PCB board from light to semi-finished products, finished products will involve the use of flux and organic acids, so it should use professional semiconductor cleaning agent in the final product to complete the cleaning and drying of the surface. However, due to the actual production of non-standard process or simplified process, resulting in the colligation to the finished panel of electronic and electrical products on the residual organic acids and cation and ions too much, so the detection of residual ions on the surface of the circuit board is imperative.
In response, the International Association of Electronic Industry Connections (IPC) has published the IPC-TM-650 Test Methods Manual for the detection of ion content on the surface of printed circuit boards and printed circuit board assemblies. The standard is also applicable to ion contamination testing and failure and reliability analysis of general electronic and electrical products.
IPC-TM-650 provides for the use of ion chromatography for the determination of 7 kinds of anions, 6 kinds of cations and 8 kinds of organic acids on the surface of the circuit board and circuit board components, a total of 21 kinds of ions. The anions are F -, Cl -, Br -, NO 2-, NO 3-, PO 43-, SO 42-, cations are Li +, Na +, NH 4+, K +, Mg 2+, Ca 2+, organic acids are formic acid, acetic acid, adipic acid, glutamic acid, malic acid, mesonic acid, succinic acid, phthalic acid.
Using the Swiss Vantone dual channel ion chromatography system coupled with the exclusive double English blue matrix elimination sample pretreatment technology, 21 components can be tested and all detected in one analysis, greatly improving your work efficiency.
Schematic diagram of Swiss Vantone double blue matrix elimination sample pretreatment technology
Since 75% isopropanol aqueous solution is used as the extraction liquid in IPC-TM-650, in order to avoid the interference of isopropanol matrix and its impurities on the analysis results, the isopropanol and its impurities in the sample need to be removed before entering the ion chromatography. Swiss Vantone blue matrix elimination sample pretreatment technology can be online automatic separation of the ions to be measured from the matrix, remove isopropanol and its impurities on the chromatographic column interference, for you to save a lot of sample pretreatment time. This technique can be used for the simultaneous analysis of the anion channel and cation channel, and then the sample can be analyzed in the anion channel and cationic channel respectively, so as to realize one injection and simultaneously detect 21 kinds of ions to be tested.