JPS58207390A - Electrically conductive roll for electroplating - Google Patents

Abstract

PURPOSE:To further enhance the corrosion resistance of the resulting titled electrically conductive roll, by providing a specified composition consisting of C, Si, Mn, Cr, Mo, Cu, Fe, one or more among Al, Ti, Nb, V, W and Co, and the balance Ni. CONSTITUTION:This electrically conductive roll for electroplating has a composition consisting of, by weight, <=0.10% C, <=1.5% Si, <=1.5% Mn, 14-21% Cr, 13-20% Mo, 1-5% Cu, <=6% Fe, one or more among <=0.5% Al, <=1.0% Ti, <=1.5% Nb, <=0.5% V, <=3.0% W and <=5.0% Co, and the balance essentially Ni. An alloy having said composition is subjected to soln. heat treatment to make the austenite matrix uniform and to provide corrosion and wear resistances, and the alloy is formed into the roll.

Description

[Detailed description of the invention] It is something that

Conventionally, J-Ko S-LS was used as an energizing roll for electroplating.
Corrosion-resistant steels such as OS/G and J-K S-stys37I- have been used, but these corrosion-resistant steels have poor corrosion resistance such as galvanic galvanic corrosion and corrosion due to acidic solutions, as well as premature wear resistance. A significant roughening t'L occurs, resulting in
It was necessary to sharpen it for your own use in a short period of time (for example, one week).

The present applicant has solved the above-mentioned drawbacks of the conventionally used corrosion-resistant steel, and has developed a method that can be used as a current-carrying roll for electroplating without impairing its conductivity, and that can be used for particularly harsh processes such as electrolytic galvanizing and electrolytic tin plating. Patent Application No. 3 Dede, 1972 (1973) developed a roll for electroplating that has excellent corrosion resistance under heavy current conditions, as well as high hardness, toughness and strength, and wear resistance. However, the purpose of the present invention is to improve this current-carrying roll for electroplating so as to particularly improve its corrosion resistance. be.

In order to achieve all of its objectives, the roll according to the invention has a weight i% of CO. 10% or less, Si/j% or less, Mn t
, s % or less, Cr/II% or more x 1% or less, MO/3
20% or less, Cu/Ti or more and S% or less, 784% or less, including Al-0j% or less, Ti/, Ochi or less, Nb/4% or less, VO0! r% or less, T3. It is characterized by containing one or more components of θ, ca's, o% or less, with the remainder consisting essentially of Ni. The difference is that Cu is added in a range of t% or more and 5% or less.

Hereinafter, the present invention will be explained in detail based on examples thereof.

As mentioned above, the roll according to the present invention is characterized by containing Nil, Or, MO, and Cu as main components, but as will be explained in detail later, it also has corrosion resistance and In order to have both wear resistance and abrasion resistance, a solution treatment is applied to make the austenite base uniform and the roll is made into a roll.

First, we will explain the reason why each chemical component in the uninvented roll is limited to the specific ranges mentioned above.

As a basic component, N1 stabilizes the matrix as an austenite structure, and furthermore, Ni itself is responsible for the ion rotation of the after-horizon, so the corrosion rate is low, and the corrosion formed film is dense. , the protective effect is strong, and the excellent passivation ability is waiting.

When Nil or Mo is added, the corrosion dissolution rate decreases as the content increases, increasing the passivity sensitization ability and significantly improving corrosion resistance. This corrosion resistance becomes effective from a content of 73 wt%, and if the content exceeds 20 wt%, intermetallic compounds are easily precipitated, and the corrosion resistance is even deteriorated.

Cr has a low corrosion dissolution rate, t,, a). In this alloy, the content of Cjr forms a matrix with N1 and MO, forming a stronger protective film and contributing to the ability to absorb fudo. %, it becomes saturated when the -/W°C ratio is exceeded, and the formation of intermetallic compounds (E) causes embrittlement and further deteriorates corrosion resistance.

Cu, which is added for the first time in the present invention, constitutes a matrix due to the coexistence of Cu and N11M0, forms a strong protective film on the surface layer, and provides passivation ability. The content of O is 7w in this alloy.
The effect appears at t%, but when it exceeds 5wt%, the formation of intermetallic compounds becomes significant, causing embrittlement and further deteriorating corrosion resistance.

Although the inclusion of C, Si, and FeI/i is unavoidable due to manufacturing reasons, it is preferable that the amounts are as small as possible.

However, due to the presence of C, carbides precipitate,
Since corrosion resistance deteriorates, it is preferable that the content be less than -o, o A wt %, but even if it is less than 0.7 wt %, it can be made practically acceptable by completely performing solution treatment.

However, in order to stabilize this excess carbon, it is effective to add an element such as T1°Nb. To achieve this effect, T
1≧Blue x Cwtchi, Nb≧1010X0chi are necessary. Therefore, Ti! Ii/, Owt or less, N't) is limited to 7.5"yt or less.

Although Sl precipitates intercalated -8- products throughout the entire range due to the M content, deterioration of corrosion resistance can be prevented by completely applying solution treatment. The content of Si varies depending on the manufacturing method, but it can be obtained from fish such as deoxidized or salted fish, /, j-
It is necessary to contain less than wt%.

The key to preventing the precipitation of this intermetallic compound is to effectively use a deoxidizing element such as A1 instead of +91 as much as possible. The effective wealth of A1 is
It is 0.3 wt% or less.

Regarding F+e, although there is some deterioration in sedimentation and corrosion resistance even if it is less than xwt%, the influence is not significant.

Although the effect of Mn is not so remarkable, it expands and stabilizes the γ phase range and improves lζ hot workability. The responsibility is /JWt 4 or less 1, ■, 0,3w
When the content is less than t%, crystal grains are made finer, some hardening is observed, and wear resistance is improved, but when O, j, Wt is 4 or more, corrosion resistance is deteriorated.

W, like MO, improves corrosion resistance and increases strength, but if it exceeds 3%, intermetallic compounds tend to precipitate.9 To obtain a uniform structure, solution treatment at 1220°C is required. I need.

Therefore, it is limited to 3% or less.

Next, an embodiment of the current-carrying roll for electroplating of the present invention will be described based on the results of experiments conducted in comparison with conventional roll materials.

Table 2 shows the chemical composition of the sample material (judoki), and Table 2 shows the electrical corrosion resistance and abrasion resistance under electric current, and the mechanical properties. In addition, this electrical corrosion resistance and abrasion resistance are as shown in the attached drawing 1.

+3%H, So, , PH/, 2, current density 4'OA
A test roll 2 was immersed in a bath liquid under the conditions of /drrL2, a brake roll 3 and a drive roll q were placed before and after it, and a constant tension was applied through a mild steel tube S. was carried out. In addition, this corrosion-resistant and abrasion-resistant trial is
A comparison was made based on the roll life ratio (see note 3 in the table) and the rate of occurrence of scratches and dents on the roll surface due to mechanical factors (see note 3 in the table) after - weeks of energized use. .

Table u fC shows the amount of corrosion tested on some of the rolls of the present invention in the state of casting.
The results are also indicative.

As shown in Table 1, the sample material is JI as a conventional alloy.
SSC! S/9 and SC83/B, and Special Patent No. 1 Persistence concerning the earlier patent application and application of the above-mentioned present applicant! ;! ;-/3 ke 39
Nn/ is described as an example of the invention alloy in the specification of No. 9 "Electrifying roll for electroplating".

Ko, 3. Examples of the alloys of the present invention employing alloys Nos. II and 5 include NCL1, 7. g and /g, and
-7 basic components (center values for both Cr and Mo), Co,
%9. -10. //, /l and /
3, and furthermore, the negative component of Nn/4' (center value of Cr, MO(7) upper limit 4@) lco, OO, -AJ and Ti, A4 and Nb, v, w were added, respectively. Each floor/! , /l, , /7-. 1g and 19
It's Toshide.

Regarding the amount of corrosion shown in the table, the test piece was immersed in a boiling sulfuric acid solution with a concentration of 30% and a boiling salt solution with a concentration of 0%, and the degree of corrosion f/cm2/day was determined.

As can be seen from the table, the alloy of the present invention (submersible treatment temperature 1
1500C) is JIS SC8/'I-, 5C83
/4 and hkl/, :1,3. Compared to φ and S alloys, this alloy exhibits relatively excellent corrosion resistance. Furthermore, from the table below, it can be seen that the uninvented alloys have extremely excellent corrosion resistance even in the as-cast state.

Furthermore, as is clear from the table, the roll according to the present invention has a lifespan ratio of 73 to .20 in terms of corrosion and wear resistance compared to the conventional roll using JIS 5US3/A.
It has doubled. In addition, the scratch occurrence rate is between 1.23 and 10%, and this is because the roll has excellent mechanical properties and no scratches or dents occur on the roll surface. it is conceivable that. Furthermore, the conductivity is JIS
Although the electrical resistance of -8US3/4 is 7jμΩ (7), it is inferior to /25μΩα, but it is considered that up to /70μΩm is acceptable in practice, so this point does not pose a problem.

Next, considering Table 2 for each ffi component, Nn&, 7. Between g and Nn/'I, the central value of Cr, the upper limit of Mo, m/'l,
Cr.

Nnza with a lot of Cu is excellent in MO Koshin value, JIS-3US
,? /Al, the life ratio is 2 and 2, respectively.
In addition, the flaw incidence rate is three times higher than that of U and S-Da. In terms of life ratio, 1θ and 16, in which the amount of Si was reduced and A1 was added, and T1 was added to stabilize C, and 1I&Lll and 17, in which Nb was added, were JIS It shows 1g times that of -8US3/4 and 20 to 23 times. In this way, if the life ratio is 2, it is still 10. ll-and//.

17 is the basic component lII [l/s, 7. g and N11
The effect of adding L, Ti, and Nb, which changes the life ratio of L, does not appear. In addition, for 1g and 1g to which 'V was added, the lifespan was 27 times and 17 times that of JIS-8US3'/B, respectively, and the flaw occurrence rate was also 3 to q times higher. shows the value of However, regarding mechanical properties, I"a' with other compositions
No significant difference was observed.

As mentioned above, the basic components of the roll according to the present invention are:
Although the roll is based on Ni-MoCr, Ou, the roll according to the present invention has sufficient corrosion resistance even under particularly severe corrosion conditions during current galvanic corrosion. This is even better than the one in Patent Application I. Therefore, the current-carrying roll according to the present invention conforms to JIS-8O8/'1. t or JIS-8O8,7/
Current corrosion resistance condition PH that could not be obtained with A
It can be used even in PHI, A~7.6, and exhibits excellent corrosion resistance under particularly severe conditions PHI, A~/, g.
It not only has sufficient abrasion resistance due to its excellent mechanical properties, but also has no problems with regard to electrical conductivity, and can be fully used in practical use.

Therefore, the present invention provides a current-carrying roll for electroplating which has these properties indispensably, and which is more suitable than the previous patent application.

Note 2: The properties of Z main clothing are those obtained by rapid cooling at 2750°C and undergoing submergence treatment. It also shows the amount of corrosion in the 0-inner casting.

U life ratio is 1. Is the loading capacity JIS SUS? horse/, O
It is expressed as a ratio to the case where it is k.

The 3-flaw occurrence rate is expressed as a ratio of the total of scratches, indentation flaws, etc. generated on the roll surface due to mechanical factors, with JIS SUS 3/O set as 100.

[Brief explanation of drawings]

The figure is an explanatory diagram showing a test method for energizing electrical corrosion resistance and wear resistance. Patent Applicant: Mitsubishi Steel Corporation, Representative of Nippon Steel Corporation
1 Ho 11i F) June 9, 1980, Commissioner of the Japan Patent Office l, Indication of the case 1960 Patent Application No. 1 Zaza 5/No. 2 Title of the invention Current-carrying roll for electroplating 3, Amendment person case Relationship between Patent applicant name (AA!r) Nippon Steel Corporation 4, Agent 5, Subject of amendment (1) Detailed explanation of the invention in the specification Column 6 Contents of amendment Contents of the description in the specification of the application Partially corrected as follows. l Add the following sentence after the 6th line of the 7th page. The effect of Co is that it dissolves in the austenitic base containing Ni%Cr and Mo, strengthens it, forms a dense passive film on the surface, strengthens the passivation ability, and improves corrosion resistance. , s, o If the toughness exceeds 4, the toughness will decrease and the price will increase economically, so it is limited to s, o or less. A2 improves oxidation resistance, but if it exceeds 3% O, it will generate intermetallic compounds and reduce corrosion resistance.
Limited to SS or below. "2'" (page 7, line 17 "
3 Correct ``excellent'' in line j of page 9 to ``excellent''. tA Page to page, lines 19-20, ``Showing.'' is changed to ``Showing.
, 1%, and shows good corrosion resistance among these alloys of the present invention, and the effect of having a low Sl content is recognized. ” he corrected. 5 Replace Q/a and the table/and table ko on page 73 with the letter 1 and table 2 on the paper.

Claims (1)

[Claims] / C00IO% or less in weight% 81' /, left Chile bottom Mn
/,! r % or less Cr l or more 2/
MO of less than 13% or more 20 Less than or equal to Cu / Chi or more &% or less Fe B Including AJ O, 3% or less, Ti/, Ochi or less, Nb/, j-% or less, Vo, s % or less, W,? ,
1. A current-carrying roll for electroplating, characterized in that it contains 7 or more of the following components: 0% or less, cos, 04 or less, and the remainder substantially consists of lcoN1.