Gold medals will also be "skinned"?

[ Focus on Chemical Machinery Equipment Network ] The Tokyo Olympics has been over for a while, but I didn't expect it to make big news! Recently, Zhu Xueying, the women’s trampoline champion at the Tokyo Olympics, discovered an astonishing fact: This time Dong Olympic’s gold medal will actually lose its “skin”!
 

In response to the theme of environmental protection, the Tokyo Olympic Organizing Committee recycled 78,985 tons of waste electronic products, extracted nearly 32 kilograms of pure gold, 3,500 kilograms of pure silver, and 2,200 kilograms of pure copper, and finally produced 5,000 medals
.
Let’s share with you here.
The Olympic gold medal is not pure gold.
According to the International Olympic Committee, the gold medal only needs to contain 92.
5% pure silver and 6 grams of gold.
6 grams of gold is on the surface of the medal, the other 550 grams are all silver
.

 

Faced with questions from netizens, the Tokyo Olympic Organizing Committee also formally responded
.
The Tokyo Olympic Organizing Committee stated that the peeling part is not the gold-plated layer, but just a layer of coating on the surface of the gold medal, which will not affect the quality of the gold medal itself
.
The purpose of adding this layer of coating film is to prevent scratches or stains on the medal, and the coating film will not adhere to the surface of the medal
.

 

During the electroplating process, the cathode current density increases as the temperature rises, and the plating layer becomes soft, thick, and reddish yellow
.
The temperature is lower, the cathode current density range is reduced, and the coating is prone to brittleness
.
So choose a good temperature meter to accurately control the temperature, and the phenomenon of gold medal peeling will not appear
.

 

Common temperature meters
 

1.
Pressure type temperature meter
 

According to the law of liquid expansion, the pressure and temperature of a liquid of a certain quality are linear under the condition of a constant volume
.
The pressure and temperature of gas and steam also have a certain functional relationship, so the scale of the pressure thermometer should be evenly divided
.
The pressure thermometer is composed of a temperature bulb filled with a temperature sensing medium, a pressure transmission element (capillary tube) and a pressure sensitive element (spring tube)
.

 

2.
Infrared temperature measuring instrument
 

Any object will have infrared radiation, which represents the temperature of the object
.
The higher the temperature, the greater the radiation
.
Use the infrared receiver as the sensor, after digital filtering and amplification, and then function calculation, the number is displayed
.
The infrared thermometer is composed of optical system, photodetector, signal amplifier and signal processing
.
Display output and other parts
.
The optical system condenses the infrared radiation energy of the target in its field of view, and the infrared energy is focused on the photodetector and converted into a corresponding electrical signal, which is then converted into the temperature value of the measured target
.

 

　　3.
Thermocouple temperature meter
 

　　The principle of the thermocouple thermometer is to connect the "galvanometer-copper wire-iron wire-copper wire" in series into a loop.
At this time, the two ends of the iron wire and the copper wire will form two joints.
If the two are joined When the temperature is different, a voltage will be generated between them, and the weak current flowing through the iron wire and copper wire can be measured in the microammeter
.
To use a thermocouple as a thermometer, the following calibration must be done first
.
Put one joint into ice water and put the other joint into boiling water, and write down the current intensity at this time.
This is the current value when the temperature difference is 100°C
.
For two known metal wires, the current value is proportional to the temperature difference between the two junctions, and the measurement range is large, that is, from -200°C to 1700°C, and the sensitivity is very high
.

 

　　The PH value of the electroplating solution also has a great influence on the appearance and hardness of the gold medal, so it is also very important to choose the appropriate PH electrode and controller
.
In addition, the content of gold ions in the electroplating solution such as first-grade chloride ions and other impurities will affect the gold plating
.
The ph controller is a highly intelligent on-line continuous monitor.
It is composed of a sensor and a secondary meter.
It can be equipped with three-composite or two-composite electrodes to meet various applications
.
PH meters are widely used in industries, electric power, agriculture, medicine, food, scientific research and environmental protection
.
This instrument is also the inspection equipment in the QS and HACCP certifications of food factories and drinking water factories
.

 

　　Original title: The gold medal will also be "skinned"? Instrument to solve the problem