Electronic Design - Prevent PCB oxidation and PCB plating maintenance

1. Prevention of circuit board oxidation and solutions

Prevent oxidation of the circuit board: 1. Before oxidation, put the PCB circuit board in a sealed anti-static bag and store it in a dry place. 2. Do not touch the circuit board with bare hands to prevent sweat stains from causing poor adhesion of the green oil and oxidation of the copper surface. A longer time will result in obvious fingerprints after electroplating, uneven coating, and serious defects in the appearance of the product., Printed wet film or silk-printed circuit and the board surface before lamination has fingerprint grease, which can easily cause the adhesion of the dry/wet film to decrease, cause infiltration and plating separation during electroplating, and the gold plate is easy to cause surface patterns. After the solder mask is completed, the surface of the board is oxidized, and the yin and yang colors appear.

How to deal with the oxidation of the circuit board: 2, the slightly oxidized circuit board can be gently wiped with fine sandpaper to remove the oxide layer. 3. The oxidized circuit board can be soaked in hydrochloric acid, sulfuric acid, acetic acid (white vinegar), and then cleaned with alcohol after the oxide layer is corroded.

2. Daily maintenance and maintenance of the electroplating production line of professional custom circuit board manufacturers

In the process of custom circuit board production, the electroplating department is an important part of the production of circuit boards. The electroplating production equipment is mainly divided into horizontal electroplating lines and straight electroplating lines. The transportation methods of electroplating equipment of different structures are also different, and daily maintenance And protection methods are also different. Let's take a look at the difference between these two types of electroplating production equipment!

1. Tank body: Straight plating line and horizontal plating line. The difference between the tank body is that the circuit board transportation method is different. These two methods are in the tank maintenance and In terms of protection, there is basically no big difference. The general operation steps are as follows: First, clean up each washing tank (pickling tank), sort out and replace its tank liquid, and check the spray equipment in the tank., Check whether there is clogging, and dredge the clogged status in time, clean up the conductive supports and anodes on the copper plating tank and tin plating tank and the front touch position once, and use a rag to scrub and sandpaper to polish. Check the titanium baskets and tin strip baskets in the copper plating tank and tin plating tank, and replace the rotten titanium baskets and tin strip baskets in time, and add copper balls and tin bars. After adding copper balls and tin bars in 7d, It is necessary to electrolyze the copper electroplating bath and tin electroplating bath. In addition, high and low current methods must be used for trial production, so that after the new copper balls and tin bars are added, the production function can be stabilized before production. The copper ball and anode bag should be cleaned every 90%. The tank liquid is filtered and cleaned with activated carbon every 120~150d to filter out impurities in the tank liquid, and the tin tank needs to be cleaned once.2. Oscillating machine: In order to ensure the uniformity of surface copper and the effect of hole copper during electroplating, the plate will be oscillated and shaken, and there will be an oscillating and shaking structure on the tank. In the same month, the reducer should be checked regularly to ensure that it is working. The tightness of the bolts of the sensational installation motor and the wear condition of the sensational rubber should be checked. If the wear is severe, it should be replaced in time. Check the touch scene of the power cord in the junction box for three months. If the connector is loose, it must be fastened in time. If the insulation layer of the wire is melted or aging, the power cord must be replaced in time to ensure that the power cord is in good condition. Insulation between time; all the bearings on the oscillating organization should be checked once, and the severely worn bearings should be replaced in time for the last lubrication.3. Driving: the protection and maintenance of the driving of the straight electroplating line. Clean the crane and the hanger once a week (the crane and the hanger do not need to be disassembled) to keep the appearance clean and tidy. When cleaning, you can use a rag to wipe, and use sandpaper to polish. Check the hanger once in the month to check the damage condition of the hanger; check and protect the motor and reducer of the driving, check the entire transmission equipment to ensure its normal operation. Carry out an in-depth cleaning and maintenance of the crane and the hanging equipment in three months. The hanging equipment must be removed from the crane for cleaning.

4. Conveyor equipment: Choose the conveying equipment as rollers, and use the rollers to continuously feed the circuit boards into each tank. The maintenance of the horizontal electroplating line conveying equipment is different from that of the straight electroplating line. The horizontal electroplating line conveying equipment cleans the foreign matter adhered to the rollers of the horizontal electroplating line once a week to ensure that the plate surface is clean during the process of transporting the plate. The coupling should be checked to see if it is loose. Straight electroplating line checks the rollers every three months to see if the rollers are worn out. The worn-out rollers need to be replaced in time to ensure that the board will not be jammed when the board is transported; the transmission gear, transmission shaft and The entire transmission system equipment is inspected once, and timely repairs are made on the problems that appear.5. Circulating filtration system: Check the filter cartridge of the circulation filtration system once a week to check whether the filter cartridge is leaking. Clean or replace the filter core every 10-15 days. The filter carbon core should be replaced that month to ensure the filter quality and the flow rate of the filter, the filter pump should be cleaned once and the filter hood and filter screen of the air pump should be cleaned. Check the touch scene of the pump motor power cord connector once in the same month. If it is found to be loose, it should be tightened in time. If the wire is aging, replace the new wire to ensure touch and safety insulation to protect the motor.6. Other parts: Check the power output of the power supply twice a week, check the power/electrical control heat dissipation/heat sink, and remove dust/clean to prevent affecting the heat dissipation function. Check the electrical equipment of the electrical unit in the current month. If there is damage or corrosion, replace it in time. Check all connectors. If there is a bad touch, virtual connection, or soldering, it needs to be repaired in time. If rust or damage is found, it needs to be replaced in time. Check For touch devices and relays, if the contacts are poorly touched or the contacts are stuck, they should be replaced in time. Check the main parameters of capacitors, reactors, resistors and other components. If they are abnormal, replace them as soon as possible. For the active feeding system, check the calibration once a week. Clean up the scale and dirt on the electric heater every week to prevent the internal temperature of the electric heater from becoming too high. Regarding the water and gas pipeline systems, check them once a week to see if they are running or leaking. The pipelines that show running or leaking should be repaired and replaced in time. Due to the different positioning specifications of customized PCB circuit board manufacturers, there are also certain differences in printed circuit board production equipment, and there are certain differences in the maintenance methods and protection of electroplating lines, but whether it is high-end printing The circuit board is still a low-end circuit board, and the electroplating production line must be properly protected and maintained every day to ensure that the production equipment can work normally and function stably, so as to ensure product quality.