CN106770599A - A kind of method for determining the exposed iron degree of chrome plating - Google Patents

A kind of method for determining the exposed iron degree of chrome plating Download PDF

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CN106770599A
CN106770599A CN201611123338.1A CN201611123338A CN106770599A CN 106770599 A CN106770599 A CN 106770599A CN 201611123338 A CN201611123338 A CN 201611123338A CN 106770599 A CN106770599 A CN 106770599A
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chrome plating
steel
degree
electrolyte solution
potential
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李宁
曹礼敏
黎德育
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract

A kind of method for determining the exposed iron degree of chrome plating, it is related to chrome plating to reveal the assay method of iron degree.Method the invention aims to solve the problems, such as existing method measure chrome plating dew iron degree is difficult quantization, complex operation.Method：First, electrolyte solution is prepared；2nd, the linear sweep voltammetry curve of steel and crome metal is determined；3rd, the measure of the potentiostat anode polarization curve of steel and crome metal；4th, read polarization current value and be converted to the degree that current density contrasts exposed iron.Assay method of the invention is simple to operate, is very easy to implement, and testing cost is relatively low.The present invention is applied to the degree for determining the exposed iron of chrome plating.

Description

A kind of method for determining the exposed iron degree of chrome plating
Technical field
The present invention relates to the assay method that chrome plating reveals iron degree.
Background technology
Chromium coating dew iron is a problem of generally existing, and the method for detection chromium plating steel plate dew iron has two kinds at present, that is, paste Filter paper method and iron solution value method.The cardinal principle for pasting filter paper method is exposed iron elder generation and HNO at coating dew iron3React, Become Fe (II), then again with K3[Fe(CN)6] reaction generation blue precipitate, so as to react the dew iron degree of chrome plating, this method is only Can detect whether to reveal iron, but dew iron degree is difficult detection, and be difficult to quantify；Iron solution value rule be use volume fraction for 20% H2SO4Used as corrosive medium, mass fraction is 30% H2O2Used as oxidant, it can be sulfuric acid from chromium coating hole The Fe (II) that dissolution comes in gap is oxidized to Fe (III), using the KSCN of 65g/L as developer, with ferric rhodanate (III) colorimetric method The quality of dissolution iron is determined, so as to characterize the dew iron degree of chromium coating, this method complex operation.
The content of the invention
The method that chrome plating dew iron degree is determined the invention aims to solve existing method is difficult quantization, complex operation Problem, and provide it is a kind of determine the exposed iron degree of chrome plating method.
A kind of method for determining the exposed iron degree of chrome plating, is specifically realized by the following steps：
First, electrolyte solution is prepared：
By NaHCO3、Na2CO3It is dissolved into distilled water with NaCl, obtains electrolyte solution；
NaHCO in electrolyte solution described in step one3Concentration be 0.05mol/L~0.10mol/L；
Na in electrolyte solution described in step one2CO3Concentration be 0.03mol/L~0.06mol/L；
The concentration of NaCl is 0.5mol/L~1.0mol/L in electrolyte solution described in step one；
2nd, the linear sweep voltammetry curve of steel and crome metal is determined：
1., steel is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
2. crome metal, is determined in electrolyte solution and sweep limits is the linear sweep voltammetry song under -0.3V~1.5V Line；
3., the linear sweep voltammetry curve of contrast steel and crome metal, selects the polarization current of crome metal close to zero The current potential when polarization current of steel is larger, i.e. 0.6V~1.0V；A current potential is selected under the potential range of 0.6V~1.0V Value, and the potentiostat anode polarization curve of chrome plating is determined under the current potential of selection, sweep time is 300s；
Step 2 3. described in chrome plating be the chrome-faced of steel, the plated surface chromium content of chrome plating is 100mg/m2~ 250mg/m2；
3rd, the measure of the potentiostat anode polarization curve of steel and crome metal：
1., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the steel in electrolyte solution is determined under fixed potential value, sweep time is 300s；
2., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the crome metal in electrolyte solution is determined under fixed potential value, sweep time is 300s；
4th, read polarization current value and be converted to the degree that current density contrasts exposed iron：
The polarization current value of chrome plating, is converted into current density Z when the reading scan time is 300s；
When the polarized current density value of chrome plating is 3.5 × 10-2A/dm2＜ Z ＜ 4.5 × 10-2A/dm2When, illustrate chromium plating The degree of the exposed iron of plate is big；
When the polarized current density value of chrome plating is 2.5 × 10-2A/dm2＜ Z≤3.5 × 10-2A/dm2When, illustrate chromium plating In the degree of the exposed iron of plate；
When the polarized current density value of chrome plating is 0 ＜ Z≤2.5 × 10-2A/dm2When, illustrate the journey of the exposed iron of chrome plating Degree is small.
Advantages of the present invention：
First, the dissolution potential present invention utilizes steel with crome metal in electrolyte solution is different, selects suitable Current potential carries out the measurement of potentiostat anode polarization curve；Under suitable current potential, only dissolved ferric iron, and crome metal is insoluble, institute It is the dissolution current of iron with the current value on polarization curve, polarization current is bigger, then illustrates that exposed iron degree is bigger；
2nd, the method for the present invention measure exposed iron degree of chrome plating is reasonable in design, is completed by electrochemical method, experiment step It is rapid simple easy to implement, dew iron degree is quantified, it is environmentally safe；
3rd, principle of the invention also can be used for electroplate of the coating dissolution potential higher than matrix dissolution current potential, the scope of application Extensively；Suitable for tin plate and nickel-plated sheet；For example during the measurement exposed iron degree of tin plate, because tin is molten in electrolyte solution Solution current potential is higher than iron, so can equally determine its exposed iron degree using this method；
4th, assay method of the invention is simple to operate, is very easy to implement, and testing cost is relatively low.
The present invention is applied to the degree for determining the exposed iron of chrome plating.
Brief description of the drawings
Fig. 1 is linear sweep voltammetry curve, and 1 steel obtained by the step 2 of embodiment one is in electrolyte solution in Fig. 1 It is the linear sweep voltammetry curve under -0.3V~1.5V to neutralize sweep limits；2 is the crome metal of gained in the step 2 of embodiment one Linear sweep voltammetry curve in the electrolyte solution and under sweep limits is -0.3V~1.5V；
Fig. 2 is potentiostat anode polarization curve, and 1 is that 3. middle Tin Free Steel is 100mg/m to the step 2 of embodiment one in Fig. 22's The potentiostat anode polarization curve of chrome plating, 2 be the step 3 of the embodiment one 1. steel of middle gained potentiostat anode polarization it is bent Line, 3 is the potentiostat anode polarization curve of the step 3 of the embodiment one 2. crome metal of middle gained；
Fig. 3 is potentiostat anode polarization curve, and 3. middle Tin Free Steel is 100mg/m to the step 2 of 1 embodiment two in Fig. 32Plating The potentiostat anode polarization curve of chromium plate, 2 is that 3. middle Tin Free Steel is 150mg/m to the step 2 of embodiment two2Chrome plating perseverance electricity Position anodic polarization curves, 3 is that 3. middle Tin Free Steel is 200mg/m to the step 2 of embodiment two2Chrome plating potentiostat anode polarization Curve, 4 is that 3. middle Tin Free Steel is 250mg/m to the step 2 of embodiment two2Chrome plating potentiostat anode polarization curve, 5 is real Apply the potentiostat anode polarization curve of the step 3 of the example two 1. steel of middle gained, 6 is the gold of the step 3 of embodiment two 2. middle gained Belong to the potentiostat anode polarization curve of chromium；
Fig. 4 be the step 3 of embodiment two 1. middle steel by amplifying 200 times after potentiostat anode polarization under the microscope Microscopic appearance figure；
Fig. 5 is that 3. middle Tin Free Steel is 100mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 6 is that 3. middle Tin Free Steel is 150mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 7 is that 3. middle Tin Free Steel is 200mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 8 is that 3. middle Tin Free Steel is 250mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 9 is that 3. middle Tin Free Steel is 45000mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under the microscope.
Specific embodiment
Specific embodiment one：Present embodiment be it is a kind of determine the exposed iron degree of chrome plating method, specifically by with What lower step was completed：
First, electrolyte solution is prepared：
By NaHCO3、Na2CO3It is dissolved into distilled water with NaCl, obtains electrolyte solution；
NaHCO in electrolyte solution described in step one3Concentration be 0.05mol/L~0.10mol/L；
Na in electrolyte solution described in step one2CO3Concentration be 0.03mol/L~0.06mol/L；
The concentration of NaCl is 0.5mol/L~1.0mol/L in electrolyte solution described in step one；
2nd, the linear sweep voltammetry curve of steel and crome metal is determined：
1., steel is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
2. crome metal, is determined in electrolyte solution and sweep limits is the linear sweep voltammetry song under -0.3V~1.5V Line；
3., the linear sweep voltammetry curve of contrast steel and crome metal, selects the polarization current of crome metal close to zero The current potential when polarization current of steel is larger, i.e. 0.6V~1.0V；A current potential is selected under the potential range of 0.6V~1.0V Value, and the potentiostat anode polarization curve of chrome plating is determined under the current potential of selection, sweep time is 300s；
Step 2 3. described in chrome plating be the chrome-faced of steel, the plated surface chromium content of chrome plating is 100mg/m2~ 250mg/m2；
3rd, the measure of the potentiostat anode polarization curve of steel and crome metal：
1., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the steel in electrolyte solution is determined under fixed potential value, sweep time is 300s；
2., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the crome metal in electrolyte solution is determined under fixed potential value, sweep time is 300s；
4th, the degree that polarization current value contrasts exposed iron is read：
The polarization current value of chrome plating, is converted to current density Z when the reading scan time is 300s；
When the polarized current density value of chrome plating is 3.5 × 10-2A/dm2＜ Z ＜ 4.5 × 10-2A/dm2When, illustrate chromium plating The degree of the exposed iron of plate is big；
When the polarized current density value of chrome plating is 2.5 × 10-2A/dm2＜ Z≤3.5 × 10-2A/dm2When, illustrate chromium plating In the degree of the exposed iron of plate；
When the polarized current density value of chrome plating is 0 ＜ Z≤2.5 × 10-2A/dm2When, illustrate the journey of the exposed iron of chrome plating Degree is small.
The advantage of present embodiment：
First, present embodiment make use of dissolution potential of the steel with crome metal in electrolyte solution different, select conjunction Suitable current potential carries out the measurement of potentiostat anode polarization curve；Under suitable current potential, only dissolved ferric iron, and crome metal is insoluble Solution, so the current value on polarization curve is the dissolution current of iron, polarization current is bigger, then illustrate that exposed iron degree is bigger；
2nd, the method for the present embodiment measure exposed iron degree of chrome plating is reasonable in design, is completed by electrochemical method, real Test step simply easy to implement, dew iron degree is quantified, it is environmentally safe；
3rd, the principle of present embodiment also can be used for electroplate of the coating dissolution potential higher than matrix dissolution current potential, be applicable It is in extensive range；Suitable for tin plate and nickel-plated sheet；For example during the measurement exposed iron degree of tin plate, because tin is in electrolyte solution Dissolution potential higher than iron, so can equally determine its exposed iron degree using this method；
4th, the assay method of present embodiment is simple to operate, is very easy to implement, and testing cost is relatively low.
Present embodiment is applied to the degree for determining the exposed iron of chrome plating.
Specific embodiment two：Present embodiment is with the difference of specific embodiment one：Electrolysis described in step one NaHCO in matter solution3Concentration be 0.10mol/L.Other steps are identical with specific embodiment one.
Specific embodiment three：One of present embodiment and specific embodiment one or two difference is：Institute in step one Na in the electrolyte solution stated2CO3Concentration be 0.05mol/L.Other steps are identical with specific embodiment one or two.
Specific embodiment four：One of present embodiment and specific embodiment one to three difference is：Institute in step one The concentration of NaCl is 1.0mol/L in the electrolyte solution stated.Other steps are identical with specific embodiment one to three.
Specific embodiment five：One of present embodiment and specific embodiment one to four difference is：Step 2 3. in A potential value is selected under the potential range of 0.6V~0.8V, and the constant potential anode of chrome plating is determined under the current potential of selection Polarization curve, sweep time is 300s.Other steps are identical with specific embodiment one to four.
Specific embodiment six：One of present embodiment and specific embodiment one to five difference is：Step 2 3. in A potential value is selected under the potential range of 0.8V~1.0V, and the constant potential anode of chrome plating is determined under the current potential of selection Polarization curve, sweep time is 300s.Other steps are identical with specific embodiment one to five.
Specific embodiment seven：One of present embodiment and specific embodiment one to six difference is：Step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 100mg/m2~150mg/m2.Other steps with Specific embodiment one to six is identical.
Specific embodiment eight：One of present embodiment and specific embodiment one to seven difference is：Step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 150mg/m2~200mg/m2.Other steps with Specific embodiment one to seven is identical.
Specific embodiment nine：One of present embodiment and specific embodiment one to eight difference is：Step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 200mg/m2~250mg/m2.Other steps with Specific embodiment one to eight is identical.
Beneficial effects of the present invention are verified using following examples：
Embodiment one：A kind of method for determining the exposed iron degree of chrome plating, it is characterised in that the method is specifically by following What step was completed：
First, electrolyte solution is prepared：
By NaHCO3、Na2CO3It is dissolved into distilled water with NaCl, obtains electrolyte solution；
NaHCO in electrolyte solution described in step one3Concentration be 0.1mol/L；
Na in electrolyte solution described in step one2CO3Concentration be 0.05mol/L；
The concentration of NaCl is 1mol/L in electrolyte solution described in step one；
2nd, the linear sweep voltammetry curve of steel and crome metal is determined：
1., steel is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
2. crome metal, is determined in electrolyte solution and sweep limits is the linear sweep voltammetry song under -0.3V~1.5V Line；
3., the linear sweep voltammetry curve of contrast steel and crome metal, selects the polarization current of crome metal close to zero The current potential when polarization current of steel is larger, i.e. 0.8V；The potentiostat anode polarization that chrome plating is determined under the current potential of 0.8V is bent Line, sweep time is 300s；
Step 2 3. described in chrome plating be the chrome-faced of steel, the plated surface chromium content of chrome plating is 100mg/m2；
3rd, the measure of the potentiostat anode polarization curve of steel and crome metal：
1., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Fixed potential value is potentiostat anode polarization curve of the measure steel in electrolyte solution under 0.8V, and sweep time is 300s；
2., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Fixed potential value is to determine potentiostat anode polarization curve of the crome metal in electrolyte solution under 0.8V, and sweep time is 300s；
4th, read polarization current value and be converted to the degree that current density contrasts exposed iron：
The potentiostat anode polarization current value of chrome plating, steel and crome metal when the reading scan time is 300s, and turn It is changed to current density.
The potentiostat anode polarization of chrome plating, steel and crome metal when sweep time is 300s in the step 4 of embodiment one Current density value is as shown in table 1；
Table 1
Material/Tin Free Steel (mg/m2) Steel (0) Chrome plating/100 Crome metal (∞)
Polarization current (10-2A) 3.231 2.735 0
Polarized current density (A/dm2) 4.116 3.484 0
Dew iron degree is judged according to polarization current size, polarization current is bigger, dew iron degree is bigger, polarization current from greatly to Small order：Steel ＞ chrome plating ＞ crome metals, so dew iron degree order from big to small：Steel ＞ chrome plating ＞ metals Chromium.
Fig. 1 is linear sweep voltammetry curve, and 1 crome metal obtained by the step 2 of embodiment one is molten in electrolyte in Fig. 1 In liquid and sweep limits is linear sweep voltammetry curve under -0.3V~1.5V；2 exist for the iron of gained in the step 2 of embodiment one In electrolyte solution and sweep limits is linear sweep voltammetry curve under -0.3V~1.5V；
As can be seen from Figure 1 after current potential is more than 0.8V, the polarization current of crome metal is just slowly increased by zero；And iron is in electricity After position is more than 0V, its polarization current rapidly increases, linear to increase, so selected electric potential is 0.8V.
Fig. 2 is potentiostat anode polarization curve, and 1 is the constant potential of the chrome plating of gained in the step 2 of embodiment one in Fig. 2 Anodic polarization curves, 2 is the potentiostat anode polarization curve of the iron of gained in the step 3 of embodiment one, and 3 is the step of embodiment one The potentiostat anode polarization curve of the crome metal of gained in three；
The potentiostat anode polarization curve of crome metal is a horizontal linear as can be seen from Figure 2, and polarization current value is in close proximity to Zero, illustrate that chromium dissolves；Iron is a curve with the potentiostat anode polarization curve of chrome plating, and both plots changes are non- Often similar, simply polarization current during iron stabilization is more than chrome plating, and the polarization current for illustrating chrome plating is between iron and metal Between chromium.
Embodiment two：A kind of method for determining the exposed iron degree of chrome plating, it is characterised in that the method is specifically by following What step was completed：
First, electrolyte solution is prepared：
By NaHCO3、Na2CO3It is dissolved into distilled water with NaCl, obtains electrolyte solution；
NaHCO in electrolyte solution described in step one3Concentration be 0.1mol/L；
Na in electrolyte solution described in step one2CO3Concentration be 0.05mol/L；
The concentration of NaCl is 1mol/L in electrolyte solution described in step one；
2nd, the linear sweep voltammetry curve of steel and crome metal is determined：
1., steel is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
2. crome metal, is determined in electrolyte solution and sweep limits is the linear sweep voltammetry song under -0.3V~1.5V Line；
3., the linear sweep voltammetry curve of contrast steel and crome metal, selects the polarization current of crome metal close to zero The current potential when polarization current of steel is larger, i.e. 0.8V；Determine 5 pieces of constant potential anodes of chrome plating respectively under the current potential of 0.8V Polarization curve, sweep time is 300s；
Step 2 3. described in chrome plating be the chrome-faced of steel, the plated surface chromium content of 5 pieces of chrome platings is followed successively by 100mg/m2、150mg/m2、200mg/m2、250mg/m2And 45000mg/m2；
3rd, the measure of the potentiostat anode polarization curve of steel and crome metal：
1., setting and step 2 3. it is middle determine 5 pieces of chrome platings potentiostat anode polarization curve when identical potential value, The potential value for setting as 0.8V under determine potentiostat anode polarization curve of the steel in electrolyte solution, sweep time is 300s；
2., setting and step 2 3. it is middle determine 5 pieces of chrome platings potentiostat anode polarization curve when identical potential value, The potential value for setting as 0.8V under determine potentiostat anode polarization curve of the crome metal in electrolyte solution, sweep time is 300s；
4th, the degree that polarization current value contrasts exposed iron is read：
The potentiostat anode polarization current value of 5 blocks of chrome platings, steel and crome metals when the reading scan time is 300s, and Be converted to current density；
When the polarized current density value of chrome plating is 3.5 × 10-2A/dm2＜ Z ＜ 4.5 × 10-2A/dm2When, illustrate chromium plating The degree of the exposed iron of plate is big；
When the polarized current density value of chrome plating is 2.5 × 10-2A/dm2＜ Z≤3.5 × 10-2A/dm2When, illustrate chromium plating In the degree of the exposed iron of plate；
When the polarized current density value of chrome plating is 0 ＜ Z≤2.5 × 10-2A/dm2When, illustrate the journey of the exposed iron of chrome plating Degree is small.4 pieces of potentiostat anode polarizations of chrome plating, steel and crome metal when sweep time is 300s in the step 4 of embodiment two Current density value is as shown in table 2；
Table 2
Dew iron degree is judged according to polarization current size, polarization current is bigger, and dew iron degree is bigger, as known from Table 2, polarization Electric current order from big to small is：Steel ＞ Tin Free Steels are 100mg/m2Chrome plating ＞ Tin Free Steels be 150mg/m2Chrome plating ＞ Tin Free Steels are 200mg/m2Chrome plating ＞ Tin Free Steels be 250mg/m2Chrome plating ＞ crome metals, so dew iron degree is from big It is to small order：Steel ＞ Tin Free Steels are 100mg/m2Chrome plating ＞ Tin Free Steels be 150mg/m2Chrome plating ＞ Tin Free Steels It is 200mg/m2Chrome plating ＞ Tin Free Steels be 250mg/m2Chrome plating ＞ crome metals.
Fig. 3 is potentiostat anode polarization curve, and 3. middle Tin Free Steel is 100mg/m to the step 2 of 1 embodiment two in Fig. 32Plating The potentiostat anode polarization curve of chromium plate, 2 is that 3. middle Tin Free Steel is 150mg/m to the step 2 of embodiment two2Chrome plating perseverance electricity Position anodic polarization curves, 3 is that 3. middle Tin Free Steel is 200mg/m to the step 2 of embodiment two2Chrome plating potentiostat anode polarization Curve, 4 is that 3. middle Tin Free Steel is 250mg/m to the step 2 of embodiment two2Chrome plating potentiostat anode polarization curve, 5 is real Apply the potentiostat anode polarization curve of the step 3 of the example two 1. steel of middle gained, 6 is the gold of the step 3 of embodiment two 2. middle gained Belong to the potentiostat anode polarization curve of chromium.
The potentiostat anode polarization curve of crome metal is a horizontal linear as can be seen from Figure 3, and polarization current value is in close proximity to Zero, illustrate that chromium dissolves；Iron is a curve, their plots changes with the potentiostat anode polarization curve of chrome plating Closely similar, simply polarization current during iron stabilization is more than chrome plating, and with the rising of Tin Free Steel, polarization current is under Drop, illustrates that dew iron degree is being reduced.
Using USB microscopes (200 ×) observation by steel, the microscopic appearance of chrome plating after potentiostat anode polarization, Result is as shown in Fig. 4~9.
Fig. 4 be the step 3 of embodiment two 1. middle steel by amplifying 200 times after potentiostat anode polarization under the microscope Microscopic appearance figure；
Fig. 5 is that 3. middle Tin Free Steel is 100mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 6 is that 3. middle Tin Free Steel is 150mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 7 is that 3. middle Tin Free Steel is 200mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 8 is that 3. middle Tin Free Steel is 250mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under microscope；
Fig. 9 is that 3. middle Tin Free Steel is 45000mg/m to the step 2 of embodiment two2Chrome plating by after potentiostat anode polarization Amplify 200 times of microscopic appearance figure under the microscope；
From fig. 4, it can be seen that because clean steel iron does not have the protection of chrome plating, the dissolving of large area is there occurs, and molten Solution rear occurs in that less circular pit, and this is to continue longitudinal direction dissolving after surface is dissolved；
By Fig. 5~8 as can be seen that due to the covering of chrome plating, the dissolving of chromium plating plate surface not occurrence of large-area, simply Dissolved at the position of locally dew iron, form circular pit, with the increase of Tin Free Steel, revealing untouchable product will necessarily decline, and plate It is local fewer and feweri that layer surface dissolves, and the circular pit of formation also diminishes, and illustrates that layers of chrome is served necessarily to iron-based body Protective effect；
As shown in Figure 9, when Tin Free Steel is 45000mg/m2When, equivalent to pure chromium, vestige of the surface without dissolving illustrates that chromium exists Passive state is under this current potential, is not dissolved.

Claims (9)

1. it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that what the method was specifically realized by the following steps：
First, electrolyte solution is prepared：
By NaHCO3、Na2CO3It is dissolved into distilled water with NaCl, obtains electrolyte solution；
NaHCO in electrolyte solution described in step one3Concentration be 0.05mol/L~0.10mol/L；
Na in electrolyte solution described in step one2CO3Concentration be 0.03mol/L~0.06mol/L；
The concentration of NaCl is 0.5mol/L~1.0mol/L in electrolyte solution described in step one；
2nd, the linear sweep voltammetry curve of steel and crome metal is determined：
1., steel is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
2., crome metal is in electrolyte solution and sweep limits is the linear sweep voltammetry curve under -0.3V~1.5V for measure；
3., contrast steel and crome metal linear sweep voltammetry curve, select crome metal polarization current close to zero steel Polarization current it is larger when current potential, i.e. 0.6V~1.0V；A potential value is selected under the potential range of 0.6V~1.0V, and The potentiostat anode polarization curve of chrome plating is determined under the current potential of selection, sweep time is 300s；
Step 2 3. described in chrome plating be the chrome-faced of steel, the plated surface chromium content of chrome plating is 100mg/m2~ 250mg/m2；
3rd, the measure of the potentiostat anode polarization curve of steel and crome metal：
1., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the steel in electrolyte solution is determined under potential value, sweep time is 300s；
2., setting with step 2 3. it is middle determine chrome plating potentiostat anode polarization curve when identical potential value, setting Potentiostat anode polarization curve of the crome metal in electrolyte solution is determined under potential value, sweep time is 300s；
4th, polarization current value is read, the degree that current density Z contrasts exposed iron is converted into：
The polarization current value of chrome plating, is converted into current density Z when the reading scan time is 300s；
When the polarized current density value of chrome plating is 3.5 × 10-2A/dm2＜ Z ＜ 4.5 × 10-2A/dm2When, illustrate that chrome plating is naked The degree for revealing iron is big；
When the polarized current density value of chrome plating is 2.5 × 10-2A/dm2＜ Z≤3.5 × 10-2A/dm2When, illustrate that chrome plating is naked In the degree of dew iron；
When the polarized current density value of chrome plating is 0 ＜ Z≤2.5 × 10-2A/dm2When, illustrate that the degree of the exposed iron of chrome plating is small.
2. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that institute in step one NaHCO in the electrolyte solution stated3Concentration be 0.10mol/L.
3. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that institute in step one Na in the electrolyte solution stated2CO3Concentration be 0.05mol/L.
4. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that institute in step one The concentration of NaCl is 1.0mol/L in the electrolyte solution stated.
5. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that step 2 3. in A potential value is selected under the potential range of 0.6V~0.8V, and the constant potential anode of chrome plating is determined under the current potential of selection Polarization curve, sweep time is 300s.
6. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that step 2 3. in A potential value is selected under the potential range of 0.8V~1.0V, and the constant potential anode of chrome plating is determined under the current potential of selection Polarization curve, sweep time is 300s.
7. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 100mg/m2~150mg/m2。
8. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 150mg/m2~200mg/m2。
9. it is according to claim 1 it is a kind of determine the exposed iron degree of chrome plating method, it is characterised in that step 2 3. in Described chrome plating is the chrome-faced of steel, and the plated surface chromium content of chrome plating is 200mg/m2~250mg/m2。
CN201611123338.1A 2016-12-08 2016-12-08 A kind of method for determining the exposed iron degree of chrome plating Pending CN106770599A (en)

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