EP2683845A1 - Molten-salt bath for nitriding mechanical steel parts, and implementation method - Google Patents
Molten-salt bath for nitriding mechanical steel parts, and implementation methodInfo
- Publication number
- EP2683845A1 EP2683845A1 EP12713208.2A EP12713208A EP2683845A1 EP 2683845 A1 EP2683845 A1 EP 2683845A1 EP 12713208 A EP12713208 A EP 12713208A EP 2683845 A1 EP2683845 A1 EP 2683845A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bath
- nitriding
- alkali metal
- sodium
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005121 nitriding Methods 0.000 title claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 10
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 33
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical class [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 26
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 26
- ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 claims abstract description 17
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 16
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 13
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 12
- 229910001514 alkali metal chloride Inorganic materials 0.000 claims abstract description 10
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 9
- -1 alkali-metal cyanates Chemical class 0.000 claims abstract description 8
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims abstract description 7
- 150000008041 alkali metal carbonates Chemical class 0.000 claims abstract description 7
- 235000002639 sodium chloride Nutrition 0.000 claims description 39
- 150000003839 salts Chemical class 0.000 claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 150000001913 cyanates Chemical class 0.000 claims description 13
- 239000001103 potassium chloride Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000010002 mechanical finishing Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000011282 treatment Methods 0.000 description 25
- 150000001805 chlorine compounds Chemical class 0.000 description 15
- 150000002825 nitriles Chemical class 0.000 description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 11
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 150000004767 nitrides Chemical class 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 229910052700 potassium Inorganic materials 0.000 description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 7
- 229910001337 iron nitride Inorganic materials 0.000 description 7
- 150000001340 alkali metals Chemical class 0.000 description 6
- 239000011591 potassium Substances 0.000 description 6
- 235000011181 potassium carbonates Nutrition 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical group [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005255 carburizing Methods 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 3
- 238000000399 optical microscopy Methods 0.000 description 3
- GKKCIDNWFBPDBW-UHFFFAOYSA-M potassium cyanate Chemical compound [K]OC#N GKKCIDNWFBPDBW-UHFFFAOYSA-M 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000011182 sodium carbonates Nutrition 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/52—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
- C23C8/54—Carbo-nitriding
- C23C8/56—Carbo-nitriding of ferrous surfaces
Definitions
- the invention relates to the nitriding of mechanical parts made of steel.
- mechanical parts parts intended to ensure, in use, a mechanical function, which generally implies that these parts have a high hardness, good resistance to corrosion and wear; we can cite, in a non-exhaustive way:
- nitriding treatment sometimes accompanied by a carburation, in which case it is often referred to as nitrocarburizing.
- nitrocarburizing a nitriding treatment
- the concept of nitriding includes both nitriding alone, in a bath with a very low cyanide content (typically less than 0.5%), as well as nitrocarburization for cyanide contents above this threshold.
- This nitriding can be done from a gas phase or a plasma phase or from a liquid phase.
- Nitriding in the liquid phase has the advantage of allowing a significant hardening to a thickness of several microns in hours of barely a few hours, but has the important disadvantage of involving the implementation of baths of molten salts, at temperatures of the order of 600 ° C (or more), containing in practice cyanides, in combination with cyanates and carbonates (the cations are in practice cations of alkali metals, such as lithium, sodium, potassium, etc ...) - In practice the cyanates are decomposed to form cyanides, carbonates and nitrogen, which is thus available to diffuse into the nitriding part. .
- low cyanide baths should consist essentially of potassium or sodium cyanates, potassium and sodium carbonates, with more potassium than sodium (which lowered the temperature of the salt baths). ); the objective was to reduce the cyanide content to no more than 5% or even 3%); the decrease in cyanide content was to be offset by cyanates; there was no particular explanation for the role of chlorides apart from the fact that, in carburizing baths, barium chloride is a melting flux.
- nitriding-carburizing baths could contain alkaline chlorides, saving cyanides and cyanates, which are much more expensive, or lowering the melting temperature; this document concerned salt baths containing from 30% to 60% of cyanides and taught to maximize the content of n-cyanates relative to isocyanates (there were no chlorides in the example described).
- carburizing baths used at temperatures of 800 ° C. to 950 ° C. containing, by weight, from 35% to 82% of carbonate of carbonates.
- alkali metals from 15% to 35% of alkali metal cyanides, from 3% to 15% of alkali metal anhydrous silicates and up to 15% of alkaline chlorides; it was indicated that it is preferable that alkaline chlorides be present, preferably up to 10%, without giving any explanation (it seems however that the presence of chlorides has contributed to the preparation of cyanides in a usable form ).
- US Pat. No. 6,746,546 (published in 2004) has proposed a bath of molten salts containing alkali metal cyanates and alkali metal carbonates, with 45% to 53% cyanate ions (preferably 48% to 50%) maintained at 750 ° F to 950 ° F, i.e. 400 ° C to 510 ° C, to impart good corrosion resistance.
- the alkali metals were preferably sodium and / or potassium (when both were present, the potassium content was preferably 3.9: 1 relative to the sodium content); in use, this bath contained 1% to 4% cyanide (no details were given as to the presence of any other elements in the bath).
- nitriding treatments with a low cyanide content should be followed by a finishing treatment as long as a low roughness is sought, which contributes to increasing the cost treatment (labor, polishing equipment) as well as the overall duration of treatment.
- a low roughness can be obtained with nitriding baths with a high cyanide content (more than 5%), but after periods of several hours (typically 4 to 6 hours), which may seem too long on an industrial scale.
- the subject of the invention is a nitriding bath with a low cyanide content capable of, at most of the order of a few hours, of nitriding mechanical parts made of iron or steel while giving them a very low roughness (ie without porosity significant), rendering unnecessary a subsequent mechanical recovery (polishing or tribofinishing), all for a moderate cost.
- the invention proposes for this purpose an essentially constituted nitriding bath (the contents are expressed by weight):
- composition ranges are generally given for a new bath, but that one seeks in practice to stay as far as possible in these ranges; thus, there is in practice no cyanide ion in the starting bath, and it is in service that one seeks to remain at not more than 3% of cyanide ions.
- the alkali metal chlorides are lithium, sodium and / or potassium chlorides, which corresponds to chlorides which have been found to be effective, while having a moderate cost, and which do not require heavy stresses. handling point of view.
- the chloride content is between 40% and 50%, preferably at least approximately 45% (+ 1-2%, even +/- 1%). This range of contents has been found to lead, in a reasonable time, to good nitriding and low roughness.
- the carbonate content must not become too high, as this may prevent the chemical reactions that lead to nitriding.
- the cyanate content is between 20% and 40%, or even between 20% and 35%, preferably between 20% and 30%. Even more advantageously, this content is between 25% and 40%, or even between 25% and 35%, preferably between 25% and 30%.
- These cyanates may in particular be sodium cyanates (or potassium cyanates).
- alkali metal carbonates is from 20% to 30%, preferably from 25% to 30%.
- These carbonates may in particular be sodium, potassium and / or lithium carbonates; it is advantageously a mixture of sodium carbonate and lithium.
- the bath of molten salts consists essentially of (+/- 2%, or even +/- 1%):
- the bath of molten salts essentially consists, before formation of cyanides up to a maximum of 3, of (at +/- 2%, even +/- 1%):
- the invention also proposes a process for nitriding mechanical parts made of iron or steel, according to which these parts are immersed in a bath of the aforementioned composition at a temperature of between 530 ° C. and 650 ° C. for at most 4 hours.
- the parts are immersed in the bath at a temperature of between 570 ° C. and 590 ° C. for at most 2 hours.
- the duration of a nitriding treatment is conventionally of the order of 90 minutes, but it is understood that the duration of treatment depends on the nature and / or the destination of the parts; this is how one can go from some 30 minutes for valves or tool steels, up to 4 hours when one seeks to nitride on important thicknesses (layers of several tens of micrometers of thickness), or in the case of alloy steels.
- the invention is advantageously implemented with processing times of the order of 60 to 120 minutes.
- the invention also relates to mechanical parts of iron or steel nitrided according to the aforementioned method, recognizable in particular by the absence of traces of subsequent mechanical finishing process such as polishing (including the absence of fine polishing scratches).
- compositions tested are compared with standard baths (which are the same for the various examples) which do not conform to the invention.
- nitriding treatment 60 min at 580 ° C was done in a standard nitriding bath (not in accordance with the invention) consisting essentially of:
- the iron nitride layer thus formed had a thickness of 10 +/- 1 ⁇ m.
- composition according to the invention of this example appeared to be favorable to a good stability of the bath over time, in particular as regards the cyanide content.
- the samples thus nitrided were then oxidized in a bath of molten salts containing carbonates, hydroxides and nitrates of alkali metals.
- the purpose of this oxidation was to passivate the surface of the nitride layer forming an iron oxide layer of 1 to 3 ⁇ thick.
- the parts were immersed in a corrosion protection oil (containing corrosion inhibitors) as is usual with nitriding processes.
- the corrosion resistance (measured on 10 neutral salt spray parts according to ISO 9227) of the samples treated according to the invention was between 150 and 250 hours.
- the corrosion resistance (measured on 10 pieces of neutral salt spray according to ISO 9227) of the samples treated in the standard bath was between 10 and 290 hours.
- a nitriding of ferrous parts made according to the invention thus makes it possible to obtain corrosion resistance comparable to that obtained with standard bath nitriding, while improving the roughness of the surfaces, compared with a treatment in such a standard bath. .
- Annealed C45 steel samples prepared as above, were nitrided for 1 hour at 590 ° C in a bath containing:
- alkali metal chlorides NaCl, KCl
- Such a bath has proved not usable industrially since its melting temperature is greater than 600 ° C., which prevents any ferritic phase nitriding treatment (the majority of the parts are generally nitrided in the ferritic phase, ie at a temperature below 600 ° C). Only the austenitic phase nitriding is then possible, but only for temperatures above 630 ° C and with a high salt entrainment rate (high bath viscosity), which is economically unattractive.
- this composition appeared to have a higher viscosity than the composition of Example 1, which results in a greater consumption of salts.
- the degree of porosity of the nitride layers obtained according to the invention is less than 5%, whereas the degree of porosity of the nitride layers obtained with a standard bath is between 25 and 35%.
- Such a bath has proved not usable for a nitriding treatment since its liquidus temperature is greater than 600 ° C. It is recalled that the temperature of the liquidus is the temperature from which the bath is fully melted and homogeneous composition (unlike the melting temperature which is the temperature from which the bath begins to be liquid, possibly in several phases.
- the layer of iron nitride formed in the bath following the invention is of the type ⁇ (Fe 2 -3n) and has a void ratio lower than 5% (measured by light microscopy) and has a hardness of 840 ⁇ 40 HV 0 , oi ⁇
- the iron nitride layer formed in the standard bath (not in accordance with the invention) is of the ⁇ (Fe 2 -3N) type and has a porosity of between 25 and 35% (measured by optical microscopy) and has a hardness of 700 ⁇ 40 HVo.oi- A lower apparent hardness of the layers obtained with a standard bath is explained by their higher porosity rate. Indeed, it is well known that the presence of porosity (ie holes) reduces the resistance of the layers to the penetration of the indenter used for the measurement of hardness.
- the layer formed has a thickness of 10 +/- 1 ⁇
- the degree of porosity of the nitride layers obtained according to the invention is between 5 and 10%, whereas the degree of porosity of the nitride layers obtained with a standard bath is between 55 and 65%. It is known that cold-impacted steels have a high degree of work hardening which has a detrimental effect on the porosity of the layers (the higher the degree of work hardening, the more porous the layers). The invention makes it possible to obtain layers with a low porosity rate, even for strongly hardened steels.
- the samples thus nitrided were then oxidized in a bath of molten salts containing carbonates, hydroxides and nitrates of alkali metals.
- the purpose of this oxidation is to passivate the surface of the nitride layer by forming an iron oxide layer 1 to 3 ⁇ thick.
- the parts are immersed in a corrosion protection oil (containing corrosion inhibitors) as is usual with nitro ration processes.
- the corrosion resistance (measured on 10 pieces in neutral salt spray according to ISO 9227) of the treated samples according to the invention is between 310 and 650 hours.
- Example 8 (in accordance with the invention)
- the iron nitride layer formed in the bath according to the invention is of the ⁇ (Fe2-3N) type and has a porosity of less than 5% (measured by optical microscopy) and has a hardness of 1020 ⁇ 40 HV 0 , IM-
- the iron nitride layer formed in the standard bath is of the ⁇ (Fe 2 -3N) type and has a porosity of between 30 and 40% (measured by optical microscopy) and has a hardness of 830 ⁇ 40 HV 0 ,
- the lower apparent hardness of the layers obtained with a standard bath is explained by their higher porosity rate. Indeed, it is well known that the presence of porosity (ie holes) reduces the resistance of the layers to the penetration of the indenter used for the measurement of hardness.
- compositions indicated in the abovementioned examples define the new bath, it being specified that the indications of contents for the cyanide ions are valid in service, taking into account the reactions occurring during the nitriding (it is then sought to maintain the composition bath as stable as possible).
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Chemically Coating (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL12713208T PL2683845T3 (en) | 2011-03-11 | 2012-03-07 | Salt bath for nitriding of steel workpieces and its related production method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1152020A FR2972459B1 (en) | 2011-03-11 | 2011-03-11 | FOUNDED SALT BATHS FOR NITRIDING STEEL MECHANICAL PARTS, AND METHOD FOR IMPLEMENTING THE SAME |
PCT/FR2012/050479 WO2012146839A1 (en) | 2011-03-11 | 2012-03-07 | Molten-salt bath for nitriding mechanical steel parts, and implementation method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2683845A1 true EP2683845A1 (en) | 2014-01-15 |
EP2683845B1 EP2683845B1 (en) | 2019-06-26 |
Family
ID=45937409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713208.2A Active EP2683845B1 (en) | 2011-03-11 | 2012-03-07 | Salt bath for nitriding of steel workpieces and its related production method |
Country Status (21)
Country | Link |
---|---|
US (1) | US9611534B2 (en) |
EP (1) | EP2683845B1 (en) |
JP (1) | JP6129752B2 (en) |
KR (2) | KR101953523B1 (en) |
CN (1) | CN103502501B (en) |
AU (1) | AU2012247317B2 (en) |
BR (1) | BR112013018061B1 (en) |
CA (1) | CA2825652C (en) |
ES (1) | ES2745150T3 (en) |
FR (1) | FR2972459B1 (en) |
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MA (1) | MA34884B1 (en) |
MX (1) | MX342937B (en) |
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PL (1) | PL2683845T3 (en) |
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Families Citing this family (8)
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CN103882370A (en) * | 2014-03-24 | 2014-06-25 | 合肥美桥汽车传动及底盘系统有限公司 | 42CrMo or 40Cr steering knuckle nitrocarburizing treatment process |
FR3030578B1 (en) | 2014-12-23 | 2017-02-10 | Hydromecanique & Frottement | PROCESS FOR SUPERFICIAL TREATMENT OF A STEEL PART BY NITRURATION OR NITROCARBURING, OXIDATION THEN IMPREGNATION |
MX2019015782A (en) * | 2017-07-07 | 2020-08-03 | Ind Mailhot Inc | A method and system for cooling metal parts after nitriding. |
RU2688428C1 (en) * | 2018-10-01 | 2019-05-22 | Открытое акционерное общество "Завод бурового оборудования" | Method of surface hardening of thread joints of thin-walled drilling pipes |
CN111500974A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Salt bath nitriding system and nitriding method for wear-resistant and corrosion-resistant stainless steel |
CN113416918A (en) * | 2021-05-28 | 2021-09-21 | 昆山三民涂赖电子材料技术有限公司 | Nitrocarburizing process for extremely-thin parts |
US11668000B1 (en) | 2021-11-29 | 2023-06-06 | Fluid Controls Pvt. Ltd. | Method of treating an article |
FR3133394A1 (en) | 2022-03-14 | 2023-09-15 | Hydromecanique Et Frottement | METHOD FOR TREATING AN IRON ALLOY PART TO IMPROVE ITS CORROSION RESISTANCE |
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BR112013018061B1 (en) | 2022-05-10 |
JP6129752B2 (en) | 2017-05-17 |
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TN2013000300A1 (en) | 2015-01-20 |
MA34884B1 (en) | 2014-02-01 |
KR20140010141A (en) | 2014-01-23 |
CA2825652A1 (en) | 2012-11-01 |
WO2012146839A1 (en) | 2012-11-01 |
BR112013018061A2 (en) | 2020-03-31 |
CN103502501B (en) | 2016-05-25 |
ZA201306476B (en) | 2014-05-28 |
FR2972459A1 (en) | 2012-09-14 |
US20130327445A1 (en) | 2013-12-12 |
HUE046077T2 (en) | 2020-02-28 |
MX342937B (en) | 2016-10-19 |
AU2012247317A1 (en) | 2013-09-19 |
KR20190011318A (en) | 2019-02-01 |
MY164965A (en) | 2018-02-28 |
CA2825652C (en) | 2019-02-19 |
RU2590752C2 (en) | 2016-07-10 |
AU2012247317B2 (en) | 2017-03-09 |
US9611534B2 (en) | 2017-04-04 |
JP2014510840A (en) | 2014-05-01 |
EP2683845B1 (en) | 2019-06-26 |
KR101953523B1 (en) | 2019-02-28 |
CN103502501A (en) | 2014-01-08 |
UA112312C2 (en) | 2016-08-25 |
FR2972459B1 (en) | 2013-04-12 |
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