Chrome, Nickel, Blued? Chrome and nickel difference

Nickel - Chemist's Handbook 21

from "Corrosion Theory and Corrosion-Resistant Structural Alloys"

Pure nickel as a structural material is now used to a limited extent. From the chemical industry, it is almost completely replaced by corrosion-resistant steels. Occasionally, nickel is used in some industrial and laboratory installations, mainly due to its extremely high resistance to alkalis. Nickel is widely used for protective and decorative (mainly electroplated) coatings on iron and steel, as well as copper alloys (in order to increase their stability in atmospheric conditions). There is also information about the use of nickel-clad iron in the chemical industry. Nickel is slightly more electronegative than copper (see Table 2), but it is noticeably more positive than iron, chromium, zinc, or aluminum. The equilibrium potential of nickel is -0.25 V, the stationary potential is 0.5 N. Na l-0.02 V. Unlike copper, nickel has a noticeable tendency to pass into a passive state (see Chapter II). These circumstances largely determine the corrosion characteristics of nickel. In oxidizing environments, nickel alloys with chromium additives are more easily passivated and acquire corrosion resistance in more acidic oxidizing environments compared to pure nickel. It is also worth emphasizing the excellent resistance of nickel to alkalis of all concentrations and temperatures. Nickel, along with silver, is considered one of the the best materials for melting alkalis. Nickel can also impart this property to a large extent to high-nickel steels and cast irons. Nickel is very stable in solutions of many salts, in sea water and other natural waters, and in a number of organic media. Therefore, it still finds some use in the food industry. Under atmospheric conditions, nickel is quite stable, although it tarnishes somewhat. However, if a significant amount of SO2 is present in the atmosphere, then more noticeable atmospheric corrosion of nickel is observed. The most widely used of copper-nickel alloys, in addition to the cupronickel-type alloy, is an alloy based on nickel with copper of the monel type, containing about 30% Cu and 3-4% Fe + Mn, and sometimes also a little Al and Si. This alloy, in comparison with pure copper and nickel, has an increased resistance to non-oxidizing acids (phosphoric, sulfuric and hydrochloric and even medium concentrations of HF), as well as in solutions of salts and many organic acids. The corrosion resistance of monel, as well as copper and nickel, decreases markedly with increasing aeration of the medium or the access of oxidizing agents. These alloys are characterized by increased anti-corrosion, high mechanical and technological properties and relatively high strength. They are well rolled, cast, processed by pressure and cutting. In the rolled condition Ov 600-700 MPa and 6=40-45%. These alloys are a good structural material for some chemical apparatus operating in low concentrations of h3SO4 and HC1, as well as in acetic and phosphoric acids. It should also be noted that the Monel-K alloy, which is close in terms of corrosion characteristics, has a composition, % 66 Ni 29 u 0.9 Fe 2.7 Al 0.4 Mn 0.5 Si 0.15. It is characteristic of this alloy that it undergoes hardening during aging. In this state, it has high (for non-ferrous metals) mechanical properties av=1000 MPa at 6=20%. Monel-K is used for the manufacture of machine parts with a significant power load, for example, parts centrifugal pumps, as well as for bolts, if it is impossible to use steel due to its insufficient resistance or the danger of hydrogenation. The scarcity of the initial components - nickel and copper greatly limits the distribution of alloys based on them. Alloying nickel with molybdenum (over 15%) gives the alloy a very high resistance to non-oxidizing acids (see Fig. 86). The widest practical use find alloys of a similar type, the composition of which (% by weight) is given below. The composition of Hastelloy C, in addition, sometimes includes 3-5% W. All these three alloys are also quite stable in most organic media, alkalis, marine and fresh water. Along with high chemical resistance, they have great strength and are a valuable material for chemical machine and air industry. They can be obtained in the form of strips, plates, pipes, wires, they are able to be welded, cast. Their use is limited by high cost and some technological difficulties (forging, rolling). Nickel-chromium alloys (nichromes) are heat-resistant and highly heat-resistant and acid-resistant material. LiCr alloys containing no more than 35% Cr are solid solutions based on the y-lattice of nickel (austenite). Since chromium and the chromium-rich a-phase with the usual content of interstitial impurities (C, N, O) are very brittle, the content of 35% Cr should be recognized as the limit for the production of ductile alloys. However, alloys containing more than 30% Cr, in practice, are still too hard, and their processing, even at elevated temperatures, is difficult. It has been established that the purer the alloy in terms of other impurities, mainly interstitial impurities (C, N, O), the higher the chromium content is permissible without fear of worsening the possibility of technological processing of the alloy. If it is necessary to obtain very plastic nichromes (for example, for drawing wire 0.01-0.3 mm), the chromium content in silave usually does not exceed 20%. Alloys containing 25-30% (sometimes up to 33%) Cr are used for the manufacture of thick wire and strips. They are characterized by maximum heat resistance, along with high heat resistance and an extremely slow grain growth rate at elevated operating temperatures. Therefore, nichromes, unlike heat-resistant alloys of the Fe-Cr-A1 system (limped), do not noticeably lose their plasticity after working at high temperatures. In order to partial replacement nickel, improve machinability and technological properties at high temperatures, sometimes up to 25-30% Fe or more (ferro-chromiums) are introduced into these alloys. phosphorus and even carbon are considered harmful impurities reducing the ductility of the alloy. Permissible presence of not more than 0.02-0.03% 5, 0.05% P in the best varieties nichrome vacuum melting up to 0.04-0.07 and in conventional technical nichrome up to 0.2-0.3% C. Manganese is used as a deoxidizer, in addition, it contributes to grain refinement during primary crystallization and can be allowed in nichrome-type alloys up to 2% (sometimes higher). The aluminum content is usually not higher than 0.2% (in special alloys up to 1.2%), silicon is not higher than 1%, molybdenum is sometimes specially introduced into nichrome (in an amount of 1-3, and sometimes up to 6-7%) to increase corrosion resistance to chloride ions, as well as heat resistance.

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Chrome, Nickel, Blued?

People's Commissar 02-05-2011 13:01

If the topic is in the wrong section, then please move it to the right one, because I did not find a suitable one.

Gentlemen of the forum, tell me who is in the know. I'm going to get a Flaubert 4mm Cuno Melcher Magnum revolver. There is a choice: Chrome, Nickel, Burnished. Since the Internet search did not give results, I decided to turn to knowledgeable people: which one is better to take ??? What are the pros and cons, which is more durable and corrosion resistant ???

P.S.: The difference in price is not scary, only quality is of interest.

Groz 02-05-2011 15:16

This is not for wearing, my IMHO is blued. The front cut of the drum will not be so hemorrhagic to clean. But stainless steel is better for wearing.

Idalgo 02-05-2011 17:26

I'm for nerd.

Foxbat 03-05-2011 12:53

The nickel is nice, but it's still a plating, and soft. In addition, by itself it does not protect against corrosion, it is porous. If it is not made quite right, it will rust, which is very noticeable on the mass of cheap edged weapons of the late 19th and early 20th centuries, when they were addicted. Black spots of corrosion appear on it, especially if it is damaged.

No matter how you throw it, you can’t imagine better stainless steel!

By the way, chrome is a very rare coating for weapons, I have never seen it on a mass scale (I’m not saying that it doesn’t happen, I just haven’t seen it), only on an expensive sports one.

vovikas 03-05-2011 14:34quote: By the way, chrome is a very rare coating for weapons, I have never seen it on a mass scale (I’m not saying that it doesn’t happen, I just haven’t seen it), only on an expensive sports one. wah! I have my neshchyasny tanfogle 1911 in chrome (corrected - it was written in nickel). matte. but. it would be better to be in "no way". scratched coating after a police check - yes, well, his nafik. accidentally put "no" - again scratches. so my conclusion is only black or stainless steel, but this is not accessible to everyone at a price (I'm talking about stainless, kneshna) ... filin 03-05-2011 15:36 quote: chrome is a very rare coating for weapons Here we are again "ahead of the rest "... A huge amount was coated with chrome anyhow. It is quite common to cover with black chrome. Now both expensive and medium-priced hunting weapons are covered with black chrome. As for pistols - Izhmekh quite often sins with white chrome. It looks clumsy. And if still put on a chrome-plated PM a "golden" fuse, trigger, hammer and slide delay (sputtering with titanium nitride) - it turns out a gypsy's dream ... vovikas 03-05-2011 15:42quote: it turns out a gypsy's dream ... that's just "for the gypsies" nada!!! I serve a gypsy camp (in the line of technical equipment, don’t think it’s wrong). and their baron goes to shoot at our shooting range. a perfectly adequate man. and squints with the right eye at my 92nd Beretta, black, no frills! almost all sets of "gold" parts for the PM went there. People's Commissar 03-05-2011 19:25

Today I specified: there is nickel, blued. Chromed versions of this model do not exist, consequently, the choice is narrowed: Blued or nickel-plated?

03-05-2011 19:37

2ts don't bother. according to anyone, this is not steel, but silumin, and therefore everything else is just coloring.

quas 05/03/2011 20:16quote:Originally posted by filin:so almost all sets of "gold" parts for PM went there. Very practical cover, durable. :-)zav.hoz 04-05-2011 16:58

If you choose from nickel-plated and "blued" according to silumin, then definitely take nickel. "Burning" is peeling off once or twice. But chrome - it would be much more serious. I have a 1911 (steel) frame that has a matte Hard-Chrome finish - looks good, does not scratch and almost does not get dirty.

filin 04-05-2011 18:00quote: But chrome - it would have been much more serious. It depends on who does it. , which M.T. Kalashnikov called "punches". Marxist 04-05-2011 21:54

Chrome coating is inherently porous, and the porosity is highly dependent on the modes (the faster the coating is, the worse it is if sclerosis does not fail). Porosity is unimportant, for example, in hydraulic equipment (all the same, everything is in oil), but it is critical in weapons, where any aggressive muck accumulates in micro-techinka. Moreover, it rusts under the chrome, at first it is not visible, and when it comes out, it is too late to drink Borzh. Because expensive weapons (trunks anyway) are usually not chrome plated, but are either made entirely of stainless steel or traditional materials. And nickel plating must be distinguished between electrochemical (electroplating, like chromium) and chemical - smoother (there is no increase in current density on microroughnesses and growth of coating material on them), possibly not porous (I will not say), can be done at home.

People's Commissar 05-05-2011 22:08quote: If you choose from nickel-plated and blued according to silumin, then definitely take nickel. "Burning" is peeling off once or twice. But chrome - it would be much more serious. I have a 1911 (steel) frame that has a matte Hard-Chrome finish - looks good, does not scratch and almost does not get dirty.

No, not silumin (except for the drum).

vovikas 05-05-2011 22:37quote: No way, not silumin oh-oh! ok lumin!!! Idalgo 05-05-2011 23:03

Nerzhu need to take. Ideal for a revolver.

05-05-2011 23:13

Yes, no nerves in this version! kuno does nothing of the sort. alpha does. but only in serious calibers. so take black and tint as you wear.

Idalgo 05-05-2011 23:24quote:Originally posted by vovikas:yes, no nerves in this version! Spraying nah.vovikas 05-05-2011 23:27quote: Then of course .. blued, it is not blued. paint or something else is applied to the alloy. it's not steel!map 05-05-2011 23:33

I am for a slingshot ... with blued steel balls ...

It is not for nothing that slingshots were banned in Germany, and Flauberts were left ...

zav.hoz 05-05-2011 23:49quote:Originally posted by map:Slingshots were banned in Germany for a reason. When was it banned? At masses, I seemed to see them, although I was not at all interested.

As for aluminum, the coating is most likely oxidation, it is made with different colors. It is not erased by hand, but with a screwdriver or a rusty carnation - for one or two!

Idalgo 05-05-2011 23:55

Well, nah, such happiness, if you don’t even bury gun blue. You do what you want, but I wouldn't take it.

gotmog 06-05-2011 10:53

If the alloy is aluminum, then the black coating is most likely obtained by anodizing. There it is possible, depending on the composition of the electrolyte, to obtain desired color, besides, the oxide film obtained by anodizing is easily colored even with aniline dyes. May fade in places over time. Oxidized aluminum is usually gray-green in color. Nickel plating is chemically very strong, but thinner than electrolytic. But to cover something with black chrome - this is fucked up how to have sex - too capricious process. Among other things, the coating on aluminum alloys can be applied by gas-plasma spraying, and here the composition of the coating is limited only by the imagination of the "sprayers"

Idalgo 05/06/2011 12:03 pm quote: Originally posted by DIDI: He just didn't see the "correct gypsy" Beretta. Fuck.. give me two!!! Paul! Can you send yours for engraving? I want, Schaub like a gypsy baron!!! People's Commissar 06-05-2011 13:09

so, I take black (either blued, or some other crap). Thanks everyone for the info.

Dear admins, do not close the topic yet, because there are no similar topics on the Hansa, and if anyone needs anything, let them discuss it here, thank you in advance.

map 06-05-2011 19:59

[B] When was it banned? At masses, I seemed to see them, although I was not at all interested.

Two or three weeks ago, there was information on TV: a Lufthansa pilot was sentenced to 1.5 years for importing two slingshots and ammunition of steel balls to them into Germany ...

4erepaha 07-05-2011 16:05

Two or three weeks ago, there was information on TV: a Lufthansa pilot was sentenced to 1.5 years for importing two slingshots and ammunition of steel balls to them into Germany ...)