Chapter 118 Is this the only shortcoming? Nothing at all!
The name Dacromet does not sound like a Chinese name.
When Jiang Hui communicated with Liao Chengwen and Zhu Jiansheng, he habitually introduced Dacromet surface treatment technology.
But when Zhu Jiansheng formed a professional project approval document, he would definitely need to change his name.
Zhu Jiansheng stayed up late that day to write the report titled "Feasibility Analysis Report of Immersed Zinc Flake/Chromate Dispersion Coating".
Of course, it is definitely just a first version, and many situations need to be discussed with Jiang Hui.
So early the next morning, Zhu Jiansheng, who had dark circles under his eyes, took Lai Yongfeng, associate professor, to the Capital Automobile Manufacturing Factory to find Jiang Hui to improve the report.
As an expert in chassis technology, Lai Yongfeng is considered the most proficient in surface treatment technology in the Department of Vehicle Engineering.
After all, almost all chassis parts require surface treatment before they can be used in a car, otherwise they will rust in just a few days.
Lai Yongfeng has researched various surface treatment technologies such as electro-galvanizing, electro-cadmium plating, hot-dip galvanizing, thermal spray zinc, mechanical galvanizing, and zinc-based alloy coating.
The most important thing is that he is a die-hard supporter of Zhu Jiansheng in the Department of Vehicle Engineering.
"Xiaojiang, in this report I have written down the basic principles, basic formula, preparation process assumptions and coating testing methods of the Dacromet process, and the framework of the report has also been established."< br>
“Now I am thinking of supplementing the advantages and disadvantages of this technology, the main application scenarios and the standard requirements of the technology, etc., so that I can formally propose it to the college.”
Zhu Jiansheng handed Jiang Hui the report he had stayed up late to write, and at the same time quickly expressed his thoughts.
The credit was delivered to me by my son-in-law, now is not the time to be modest.
It is business to implement the technology as soon as possible.
"Dacromet is a new type of surface treatment technology. Compared with the traditional electroplating process, it is a kind of 'green electroplating' and is very environmentally friendly. This aspect is not taken seriously in China. I think the report You can focus on mentioning it, so that when you are exposed again in the future, everyone will feel your forward-looking attitude.”
Jiang Hui has a lot of things to do every day, and he has no need to be polite to his father-in-law. Let’s get straight to the topic.
“Its biggest advantage is definitely its super corrosion resistance. Even though its thickness is only 4-8μm, its anti-rust effect is the same as that of traditional electro-galvanizing, hot-dip galvanizing or paint coating. More than 7-10 times.”
“According to my speculation, standard parts and pipe fittings processed by the Dacromet process will not appear red after a salt spray test of 960 hours or even more than 1,200 hours. Rust.”
"The second important advantage is that its processing technology determines that there is no hydrogen embrittlement after Dacromet surface treatment, which is very suitable for coating of stressed parts."
Jiang Hui said this, and Lai Yongfeng inserted next to him He opened his mouth and asked: "Why is there no hydrogen embrittlement phenomenon?"
Hydrogen embrittlement is a shortcoming that cannot be completely overcome by the traditional galvanizing process.
Generally, the electroplating process uses pickling, electrolytic degreasing, electrodeposition and other processes, which will cause hydrogen embrittlement of the workpiece and seriously affect the quality of high-strength parts.
Now that he heard that there is no hydrogen embrittlement after Dacromet surface treatment, Lai Yongfeng became excited.
“Since Dacromet technology does not perform any acid treatment during the treatment process, there is no hydrogen permeation problem during electroplating, and the coating is cured at high temperature, so the process ensures that there will be no hydrogen in the Dacromet coating. Brittle. ”
“This allows it to be used for anti-corrosion treatment of high-strength parts with high tensile strength requirements. ”
Everyone is a professional, Jiang Hui explained simply. Immediately, Lai Yongfeng understood.
“Are there any other advantages?” Zhu Jiansheng took a pen and recorded it quickly.
"Dacromet can withstand high temperature corrosion, and the heat-resistant temperature can reach more than 300°C. However, the traditional galvanizing process will peel and be scrapped when the temperature reaches 100°C."
"Then there is its The coating has good adhesion to the metal substrate and has strong adhesion to other additional coatings. The treated parts are easy to spray and color, and the adhesion to organic coatings even exceeds that of phosphating films."
< br>“In addition, the good permeability of this process cannot be ignored.”
“With the traditional electroplating process, due to the electrostatic shielding effect, deep holes and slits in the workpiece, the inner wall of the pipe, etc. It is difficult to electroplat zinc on the parts, so the above parts of the workpiece cannot be protected by electroplating. ”
“Dacromet can enter these parts of the workpiece to form a Dacromet coating.”
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"Finally, as just mentioned, this process will not produce waste water or gas that pollutes the environment during the entire process of production, processing and workpiece coating. It does not require three wastes treatment, which reduces the cost of treatment. It will definitely be used for surface treatment in the future. Development direction. "
Jiang Hui introduced several advantages of Dacromet to Zhu Jiansheng and Lai Yongfeng in one breath.
This made the two of them more confident in this project.
“This kind of surface technology is so excellent, doesn’t it have some shortcomings?”
Lai Yongfeng didn’t mean to find fault, but he found it a bit incredible.
Early this morning, Zhu Jiansheng pulled him over to exchange Dacromet technology. Although Zhu Jiansheng had already roughly told him about the situation on the way, he still felt a little dazed.
Suddenly, such an excellent surface treatment technology appeared?
I have never heard of it before.
“Of course there is!”
Jiang Hui doesn’t mind telling everyone about the shortcomings of Dacromet. After all, these problems will be exposed sooner or later. It’s better to deal with them from the beginning. Make it clear and avoid these problem points in the future.
“Dacromet’s surface hardness is not high and its wear resistance is not good, and Dacromet-coated products are not suitable for contact and connection with copper, magnesium, nickel and stainless steel parts because they will produce contact corrosion and affect Product surface quality and anti-corrosion performance. ”
“Furthermore, the surface color of Dacromet coating is only silver white and silver gray, which is not suitable for the development of personalized needs. ”
Jiang Hui quickly summarized the problem, but Lai Yongfeng's reaction was very strange.
“Are these shortcomings?”
Obviously, in his opinion, these shortcomings are not a big problem at all.
"The electrical conductivity of Dacromet coating is not very good, so it is not suitable for use in conductive connection parts, such as grounding bolts of electrical appliances."
Jiang Hui continued to find a shortcoming, but this is what makes it so exciting. Zhu Jiansheng and Lai Yongfeng were even more relieved.
Because the impact of these shortcomings is very limited, or even negligible.
“According to your introduction, this technology is fully used in the automobile industry, construction, electric power, chemical industry, marine engineering, household appliances, railways, highways, bridges, tunnels, shipbuilding, military industry, etc. The field is developing in an all-round way and has extremely broad application prospects.”
Zhu Jiansheng’s enthusiasm suddenly became even higher.
(End of this chapter)