Anticorrosive process of fasteners
2020年12月12日Oxidation is also called blackening or bluing. The workpiece is heated in a solution of air, water vapor or chemicals at room temperature or an appropriate temperature to form a blue or black oxide film on the surface of the workpiece to improve its corrosion resistance and appearance. Surface treatment process.
In machinery manufacturing, NaOH solution heating is commonly used to blacken the workpiece. Compared with galvanizing and chrome plating, the cost is lower and the effect is good.
The black oxide film formed by blackening has a thickness of 0.5-1.5 μm and has a lower corrosion resistance than other chemical films.
Dacro
Zinc (aluminum) chromium coating is also called Dacromet, Daque Rust, Dickron. It is also called zinc-chromium coating in China. It is a new type of anticorrosive coating with zinc powder, aluminum powder, chromic acid and deionized water as the main ingredients.
The process of formulating Dacromet treatment solution into a water-soluble coating, and then directly coating it on a clean workpiece surface, and baking and curing to form a Dacromet coating.
Dacromet coating process
Organic solvent degreasing-mechanical shot blasting-spraying-baking-secondary spraying-baking-three spraying-baking drying
Dacromet is a new type of surface treatment technology. Compared with the traditional electroplating process, Dacromet is a "green plating". Its advantages are as follows:
1) .Super corrosion resistance: Dacromet film thickness is only 4-8μm, but its rust-proof effect is more than 7-10 times than traditional galvanizing, hot-dip galvanizing or coating method. The standard parts and pipe fittings processed by Dacromet process did not show red rust for more than 1200 hours after the salt spray test.
2). Hydrogen-free embrittlement: Dacromet’s treatment process determines that Dacromet does not have hydrogen embrittlement, so Dacromet is very suitable for coating of stressed parts.
3). High heat resistance: Dacromet can withstand high temperature corrosion, and the heat resistance can reach above 300 ℃. In the traditional galvanizing process, the skin is scrapped when the temperature reaches 100 ° C.
4). Good adhesion and recoating performance: Dacromet 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 are compatible with organic coatings. The binding force even exceeds the phosphating film.
5). Good permeability: Due to the electrostatic shielding effect, it is difficult to galvanize the deep holes, slits of the workpiece, and the inner wall of the pipe, 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.
6). Non-pollution and pollution: Dacromet will not produce waste gas that pollutes the environment during the entire process of production and processing and coating of workpieces, and no waste treatment is needed, reducing the cost of treatment.
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In machinery manufacturing, NaOH solution heating is commonly used to blacken the workpiece. Compared with galvanizing and chrome plating, the cost is lower and the effect is good.
The black oxide film formed by blackening has a thickness of 0.5-1.5 μm and has a lower corrosion resistance than other chemical films.
Dacro
Zinc (aluminum) chromium coating is also called Dacromet, Daque Rust, Dickron. It is also called zinc-chromium coating in China. It is a new type of anticorrosive coating with zinc powder, aluminum powder, chromic acid and deionized water as the main ingredients.
The process of formulating Dacromet treatment solution into a water-soluble coating, and then directly coating it on a clean workpiece surface, and baking and curing to form a Dacromet coating.
Dacromet coating process
Organic solvent degreasing-mechanical shot blasting-spraying-baking-secondary spraying-baking-three spraying-baking drying
Dacromet is a new type of surface treatment technology. Compared with the traditional electroplating process, Dacromet is a "green plating". Its advantages are as follows:
1) .Super corrosion resistance: Dacromet film thickness is only 4-8μm, but its rust-proof effect is more than 7-10 times than traditional galvanizing, hot-dip galvanizing or coating method. The standard parts and pipe fittings processed by Dacromet process did not show red rust for more than 1200 hours after the salt spray test.
2). Hydrogen-free embrittlement: Dacromet’s treatment process determines that Dacromet does not have hydrogen embrittlement, so Dacromet is very suitable for coating of stressed parts.
3). High heat resistance: Dacromet can withstand high temperature corrosion, and the heat resistance can reach above 300 ℃. In the traditional galvanizing process, the skin is scrapped when the temperature reaches 100 ° C.
4). Good adhesion and recoating performance: Dacromet 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 are compatible with organic coatings. The binding force even exceeds the phosphating film.
5). Good permeability: Due to the electrostatic shielding effect, it is difficult to galvanize the deep holes, slits of the workpiece, and the inner wall of the pipe, 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.
6). Non-pollution and pollution: Dacromet will not produce waste gas that pollutes the environment during the entire process of production and processing and coating of workpieces, and no waste treatment is needed, reducing the cost of treatment.
https://www.lizhan-hardware.net/
You know the one, where different shaped and colored bricks fall out of the sky and you have to arrange them in nice lines at the bottom? Hopefully with the end result of all colors matching in straight lines so that they can be removed and point gained.. I do have long and empty hours where I feel the urge to take up where I left off and I get extremely jealous when others talk about games or I see others playing them but I resist. But I?
I was happy in that I had managed to get the colors arranged and all I needed was another blue car and then we could have a full line. screw become machines where food and sleep are secondary items to all else....oh, no, what is happening to me? I sat there for a while shivering as it dawned on screw that I had entered the game itself, it had taken me over.. It would be then that I would force myself away and climb into bed only to resurface two hours later, make a large urn of coffee and re-attack with a vengeance. Extremely worrying to say the least!I have withdrawn from playing Tetris and other games of that sort hoping that I will stop having these off the screen episodes in real life. But once again I one day realized that all was not well with me, as I used to sit on my balcony and take imaginary potshots at cars as they appeared on the road... Bang, Bang, Bang, another dog bites the dust....
I would sit there for hours on end, maneuvering, shifting, attacking and withdrawing till the sun started to come up on the screw.. Behind me, confused and irritated drivers with green and red cars tooted their horns angrily wandering what this maniac was doing. One of those annoying games where you have a choice of guns and dogs keep on appearing on the screen...About The AuthorAuthor and Webmaster of Seamania. Yes, I know, pathetic really, but great fun. There I was in my blue car approaching the traffic lights when all of a sudden I swerved into the other lane thus ending up stopped neatly behind this other blue car.... In the hope that I can return to a normal existence without having off-the-screen battles."must be and ex-player", whisper, whisper, whisper. Love that game as it takes s kill and thought as well as two fingers and rapid movement and I became extremely proficient at it as time went by..... I think it must be like smoking where one never loses the urge to light up and take a draw ? just the one! No, No, I cannot! I now sit there and lecture others on the dangers of playing games and that they should stop before it is too late.
What that really means is that, "I am going to be Deck Screws Factory all night playing this game and will be totally incapable of staying awake in the office tomorrow, unless of course I play the game in the office as well"... As a Chief Engineer in the Merchant Navy Ieuan Dolby has sailed the world for fifteen years.
Related:https://www.lizhan-hardware.net/product/fastener/chipboard-screw/csk-phillips-head-deck-screw-with-nibs-zinc-plated.html
I was happy in that I had managed to get the colors arranged and all I needed was another blue car and then we could have a full line. screw become machines where food and sleep are secondary items to all else....oh, no, what is happening to me? I sat there for a while shivering as it dawned on screw that I had entered the game itself, it had taken me over.. It would be then that I would force myself away and climb into bed only to resurface two hours later, make a large urn of coffee and re-attack with a vengeance. Extremely worrying to say the least!I have withdrawn from playing Tetris and other games of that sort hoping that I will stop having these off the screen episodes in real life. But once again I one day realized that all was not well with me, as I used to sit on my balcony and take imaginary potshots at cars as they appeared on the road... Bang, Bang, Bang, another dog bites the dust....
I would sit there for hours on end, maneuvering, shifting, attacking and withdrawing till the sun started to come up on the screw.. Behind me, confused and irritated drivers with green and red cars tooted their horns angrily wandering what this maniac was doing. One of those annoying games where you have a choice of guns and dogs keep on appearing on the screen...About The AuthorAuthor and Webmaster of Seamania. Yes, I know, pathetic really, but great fun. There I was in my blue car approaching the traffic lights when all of a sudden I swerved into the other lane thus ending up stopped neatly behind this other blue car.... In the hope that I can return to a normal existence without having off-the-screen battles."must be and ex-player", whisper, whisper, whisper. Love that game as it takes s kill and thought as well as two fingers and rapid movement and I became extremely proficient at it as time went by..... I think it must be like smoking where one never loses the urge to light up and take a draw ? just the one! No, No, I cannot! I now sit there and lecture others on the dangers of playing games and that they should stop before it is too late.
What that really means is that, "I am going to be Deck Screws Factory all night playing this game and will be totally incapable of staying awake in the office tomorrow, unless of course I play the game in the office as well"... As a Chief Engineer in the Merchant Navy Ieuan Dolby has sailed the world for fifteen years.
Related:https://www.lizhan-hardware.net/product/fastener/chipboard-screw/csk-phillips-head-deck-screw-with-nibs-zinc-plated.html
You have never heard of social engineering
2019年8月28日 日常Just ask your self whether any of the following descriptions sound like you, if so then you are part of the problem!. Am I getting warmer?Or may be you are one of the free loaders. You are brain dead, but you see your self as a master mind criminal. Nothing could be feather from the truth!You enrage the real hackers when you cause damage or compromise resources. Or the reasons for cacking. You have crackerjack, and you have run it on the password file at a Unix on which you have an account.
There are people who do stuff like the above but they ARE NOT real hackers, They buy the magazine "2600" and they ask questions. Dose this sound like you?Or if not the above you are what I refer to as a non event.Dose any of this sound like you? If so you are not a hacker. In short you know nothing. You no not fully understand the essentials of hacking. They seek to rise above the rest, and then to pull everyone else up to the same new level.
Not the lies of the ignorant!I am the website administrator of the The Wandle Industrial Museum ( .If you are a real hacker, like it or not, you are a revolutionary and know it or not every thing you do is in some way connected to your search for the truth, because although to be a hacker is to question things hacking its not about asking questions. It is thanks to you morons that get bested whilst destroying everything you can get your evil terminals into that the established order (governments, companions, the mass Media etcetera) assume all hackers are like you, malicious, vandalising, thieving,
terrorist out to take over the Cement Board Screws of the world for personal gain or are devious teenagers who have nothing better to do than crash every available computer. You think the world of computers and security opens up to you through a keyboard and your redbox. You only want answers.For those who don’t know better it is thanks to the mass Media who have blown it way out of proportion. That’s why they get into the system, to search around inside a place they’ve never been, to explore all the little nooks and crannies of a world so unlike the boring cess-pool they live in. You join #hack and you ask questions. You have never heard of social engineering or if you have you think it is not important. You brag about you hacking factices.
More:https://www.lizhan-hardware.net/Cement+Board+Screws
There are people who do stuff like the above but they ARE NOT real hackers, They buy the magazine "2600" and they ask questions. Dose this sound like you?Or if not the above you are what I refer to as a non event.Dose any of this sound like you? If so you are not a hacker. In short you know nothing. You no not fully understand the essentials of hacking. They seek to rise above the rest, and then to pull everyone else up to the same new level.
Not the lies of the ignorant!I am the website administrator of the The Wandle Industrial Museum ( .If you are a real hacker, like it or not, you are a revolutionary and know it or not every thing you do is in some way connected to your search for the truth, because although to be a hacker is to question things hacking its not about asking questions. It is thanks to you morons that get bested whilst destroying everything you can get your evil terminals into that the established order (governments, companions, the mass Media etcetera) assume all hackers are like you, malicious, vandalising, thieving,
terrorist out to take over the Cement Board Screws of the world for personal gain or are devious teenagers who have nothing better to do than crash every available computer. You think the world of computers and security opens up to you through a keyboard and your redbox. You only want answers.For those who don’t know better it is thanks to the mass Media who have blown it way out of proportion. That’s why they get into the system, to search around inside a place they’ve never been, to explore all the little nooks and crannies of a world so unlike the boring cess-pool they live in. You join #hack and you ask questions. You have never heard of social engineering or if you have you think it is not important. You brag about you hacking factices.
More:https://www.lizhan-hardware.net/Cement+Board+Screws
In order to obtain good comprehensive mechanical properties, the following approaches can be taken separately:
(1) Low-carbon (alloy) steel is selected, and after quenching, tempering is performed at a low temperature of 250 ° C or lower to obtain low-carbon martensite. In order to improve the surface wear resistance of such steels, only the carbon content of each surface layer is increased, that is, surface carburization is performed, which is generally called carburized structural steel.
(2) Adopt medium carbon steel with high carbon content, and temper at high temperature (500-650 °C) after quenching (so-called quenching and tempering treatment), so that it can maintain sufficient strength under high plasticity, generally called this The steel is a quenched and tempered steel. If you want to obtain high strength, but prefer to reduce plasticity and toughness, you can take low-temperature tempering for gold-containing quenching and tempering with lower carbon content, so you get the so-called "super high strength."
Degree steel".
(3) Steel grades with carbon content between medium carbon and high carbon (such as 60 and 70 steel) and some high carbon steels (such as 80 and 90 steel), if used to manufacture springs, to ensure high elastic limit , yield limit and fatigue limit, then use medium temperature temper after quenching.
Second, the operation process
(1) Quenched and tempered steel
1. Pre-heat treatment: normalizing→annealing (pearlitic steel)→high temperature tempering (martensitic steel)
The purpose of normalizing is to refine the grain, reduce the degree of banding in the structure, and adjust the hardness to facilitate mechanical processing. Immediately after normalizing, it has equiaxed fine grains.
2. Quenching: The cylinder is heated to about 850 °C for quenching. The quenching medium can be selected according to the size of the steel and the hardenability of the steel. Generally, water or oil or even air quenching can be selected. Steel in quenched state, low plasticity and large internal stress
Read more:https://www.lizhan-hardware.net/
(1) Low-carbon (alloy) steel is selected, and after quenching, tempering is performed at a low temperature of 250 ° C or lower to obtain low-carbon martensite. In order to improve the surface wear resistance of such steels, only the carbon content of each surface layer is increased, that is, surface carburization is performed, which is generally called carburized structural steel.
(2) Adopt medium carbon steel with high carbon content, and temper at high temperature (500-650 °C) after quenching (so-called quenching and tempering treatment), so that it can maintain sufficient strength under high plasticity, generally called this The steel is a quenched and tempered steel. If you want to obtain high strength, but prefer to reduce plasticity and toughness, you can take low-temperature tempering for gold-containing quenching and tempering with lower carbon content, so you get the so-called "super high strength."
Degree steel".
(3) Steel grades with carbon content between medium carbon and high carbon (such as 60 and 70 steel) and some high carbon steels (such as 80 and 90 steel), if used to manufacture springs, to ensure high elastic limit , yield limit and fatigue limit, then use medium temperature temper after quenching.
Second, the operation process
(1) Quenched and tempered steel
1. Pre-heat treatment: normalizing→annealing (pearlitic steel)→high temperature tempering (martensitic steel)
The purpose of normalizing is to refine the grain, reduce the degree of banding in the structure, and adjust the hardness to facilitate mechanical processing. Immediately after normalizing, it has equiaxed fine grains.
2. Quenching: The cylinder is heated to about 850 °C for quenching. The quenching medium can be selected according to the size of the steel and the hardenability of the steel. Generally, water or oil or even air quenching can be selected. Steel in quenched state, low plasticity and large internal stress
Read more:https://www.lizhan-hardware.net/
