source:Industry News release time:2022-08-10 Article author:yu Popular:pcb
The circuit board will not be well tinned during SMT production. Generally, poor tinning is related to the cleanliness of the surface of the PCB bare board. If there is no dirt, there will be basically no poor tinning. Second, tinning When the flux itself is poor, temperature, etc. So what are the main manifestations of common electrical tin defects in circuit board production and processing? How to solve this problem?
1. The tin surface of the substrate or parts is oxidized and the copper surface is dark.
2. There are flakes on the circuit board that cannot be tinned, and there are particulate impurities in the plating on the board.
3. The high-potential coating is rough, and there is a phenomenon of burning the board.
4. There are grease, impurities and other debris on the circuit board surface, or there is residual silicone oil.
5. There is obvious bright edge phenomenon on the edge of the low-potential hole, and the high-potential coating is rough, and there is a phenomenon of burning.
6. One side of the coating is complete, the other side is poorly coated, and the low-potential hole has obvious bright edge phenomenon.
7. The PCB board is not guaranteed to meet the temperature or time during the soldering process, or the flux is not used correctly.
8. There are particulate impurities in the coating on the surface of the circuit board, or there are polishing particles left on the surface of the circuit during the production process of the substrate.
9. The low-potential large area cannot be plated with tin, and the surface of the circuit board is slightly dark red or red. One side has a complete coating, and the other side has a poor coating.
Improvement and prevention plan for the bad condition of PCB circuit board:
1. Strengthen the pre-plating treatment.
2. Correct use of flux.
3. Analysis of the Hexel cell to adjust the content of the light agent.
4. Check the anode consumption from time to time and add anodes reasonably.
5. Reduce the current density and regularly perform maintenance or weak electrolysis on the filtration system.
6. Strictly control the storage time and environmental conditions of the storage process, and strictly operate the circuit board production process.
7. Control the temperature during the soldering process of the PCB board at 55-80°C and ensure a sufficient preheating time.
8. Timely testing and analysis of the ingredients of the potion, timely addition, addition of current density, and extension of electroplating time.
9. Use a solvent to clean the sundries. If it is silicone oil, then you need to use a special cleaning solvent for washing.
10. Reasonably adjust the distribution of the anode, reduce the current density appropriately, plan the wiring or splicing of the board reasonably, and adjust the light agent.
Read recommendations:
Six-layer Immersion Gold Board (BGA)
Six-layer Immersion Gold Board (BGA)
Various preventive methods for immersion silver plating process
Popular recommended products
Six-layer Immersion Gold Board (BGA)
2021-05-27High frequency PCB
2021-04-27Display board (six layers)
2021-04-27Silver oil perforated plate (double-sided)
2021-04-27Computer card board (four layers)
2021-04-25Aluminum substrate (double-sided)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-27Single copper base PCB
2021-04-27Single-sided double-layer AL base PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-24Six-layer Immersion Gold Board (BGA)
2021-05-27Mobile phone template (six layers)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27High frequency PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-27High frequency PCB
2021-04-27Laminate copper-based PCB after 4L (sample)
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-24High frequency PCB
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-05-27Network communication board (sixth floor)
2021-04-29SMT stickers
2021-05-27Mobile phone board
2021-04-27Six-layer Immersion Gold Board (BGA)
2021-04-26Six-layer Immersion Gold Board (BGA)
2021-04-26SMT stickers
2021-05-27DIP plugin
2021-05-27DIP plugin
2021-05-27Mobile phone board
2021-05-27Six-layer Immersion Gold Board (BGA)
2021-04-26Six-layer Immersion Gold Board (BGA)
2021-04-26Six-layer Immersion Gold Board (BGA)
2021-04-26Related Information
The relationship between PCB safety distance and voltage
2024-04-22SMT surface mount processing.Hybrid circuit board PCB
2024-04-15PCB enterprises should pay attention to SMT matters.Electronic components PCB
2024-04-03PCB - the core building block of electronic products.Automotive Electronics PCB
2024-03-25PCB - the bridge and link of the electronic world
2024-03-18How to define high-frequency and high-precision circuit boards.Industrial Electronics PCB
2024-03-11USB PCB interface layout and wiring requirements
2024-01-22Electrolytic capacitor PCB.Steps for using PCB pins
2024-01-15Automotive ElectronicWhat aspects should be considered when processing and manufacturing PCB boards?
2024-01-08Electrolytic capaciWhat is the difference between a gold-plated circuit board and a gold-plated one?
2023-12-25When grinding PCB boards, attention should be paid to.Oscillator (belonging to crystal) PCB
2023-12-18Industrial Electronics PCB!What precautions should be taken when copying and grinding PCB boards
2023-12-11Do you know who is more suitable for LED direct display, regarding the difference between PCB board
2023-12-05Aluminum electrolytic capacitor PCB.What are the standards for selecting PCB boards
2023-11-27Surface Mount Technology (SMT) Phase PCB
2023-11-20Oscillator (belonging to crystal) PCB.The main functions of PCB board
2023-11-13What is the difference between RO filter and PCB filter
2023-11-06Method for determining blind hole PCB board
2023-11-01Electronic Manufacturing Services PCB!What are the effects of PCB board color on performance?
2023-10-23Introduction to the Manufacturing Steps and Requirements of PCBA Test Stand
2023-10-16PCB version maturity stage.AOI circuit board price
2023-09-25How to maintain a PCB circuit board
2023-09-19Development Trend of Printed Circuit Board.Zener diode PCB Vendor
2023-09-14Common problems and cause analysis of PCB circuit board sampling.Zener diode PCB price
2023-09-08What are the issues that need to be understood in PCB circuit board design?IGBT module PCB factory
2023-09-08How to reduce the risk of bending and deformation in PCB circuit board production?Inverter PCB Produ
2023-08-16What are the three main factors that constitute welding defects in PCB circuit boards?Multilayer PCB
2023-08-16The structure of a glass teapot.LCD Module PCB factory
2023-08-11Glass teapot.Inverter PCB Processing
2023-08-11PCB online debugging
2023-08-08