CN102928329B - Method for evaluating corrosion resistance and anti-cratering performance of coating on inner wall of electrophoretic paint packing bucket - Google Patents
Method for evaluating corrosion resistance and anti-cratering performance of coating on inner wall of electrophoretic paint packing bucket Download PDFInfo
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Abstract
The invention discloses a method for evaluating the corrosion resistance and the anti-cratering performance of a coating on the inner wall of an electrophoretic paint packing bucket. The corrosion resistance and the anti-cratering performance of the coating on the inner wall of the electrophoretic paint packing bucket are detected and evaluated before mass production and application of packing buckets, so that the corrosion resistance and the anti-cratering performance of the packing buckets in storage can be judged whether to be qualified or not, unqualified packing buckets are effectively removed, and the quality of electrophoretic paint is not influenced by the conditions of packing materials.
Description
Technical field
The present invention relates to coating packing, relate to the evaluation method of the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating particularly.
Background technology
Electrophoretic coating be by basic resin organic acid and formed water-soluble (latex) coating.The pail pack of electrophoretic coating mainly contains Plastic Drum and metal drum; Metal drum has stainless steel cask, steel drum, metal bucket etc.Producer is undertaken selecting different pail packs by different demand.
Containing water and solvent in electrophoretic coating, so the pail pack of electrophoretic coating will possess corrosion resistance.In addition, the appearance of film of electrophoretic coating, is mainly shrinkage cavity state, is very important technical indicator, and it directly affects the serviceable life of coating paint film swimming part, so the shrinkproof permeability of pail pack also must be qualified.
Being coated with material in existing metal drum has several, and as epoxy phenolics, phenolics, epoxy resin etc., their respective interior painting performances are also each variant.The manufacture craft of pail pack is mainly interior is coated with spraying, seam, process barrel rim etc., and these operations all can affect the life cycle of pail pack.Some subject matters of current existence are that interior painting comes off, has corrosion, electrophoretic coating shrinkage cavity influenced.The appearance of these problems mainly people use be coated with bucket in these time, often effective evaluation is not carried out to these buckets in advance, but just put into storehouse after bucket and coating packing being completed.And bucket is placed in the process of stock for a long time, the situations such as some barrel can produce corrosion, interior painting comes off, cause the plate reduction of area permeability of product bad.
So, need to set up the evaluation method of the corrosion-resistant and shrinkproof permeability of a kind of electrophoretic coating pail pack inside coating.
Summary of the invention
The object of this invention is to provide the evaluation method of the corrosion-resistant and shrinkproof permeability of a kind of electrophoretic coating pail pack inside coating; By carrying out checking and appraising to the corrosion-resistant of electrophoretic coating pail pack and impact having excellent resistance to cratering before production in enormous quantities uses, judge that whether the corrosion resistance after pail pack storage, shrinkproof permeability be qualified, effectively get rid of underproof pail pack, ensure that electrophoretic coating quality does not affect quality because of the condition of packing material.
An evaluation method for the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating, comprises the following steps:
Preparation process:
Get in new metal and be coated with bucket, in bucket, add soak solution, soak solution composition is water: methylisobutylketone: 85% formic acid=100 ~ 120:10 ~ 12:4 ~ 5, and soak solution addition is 50% of bucket volume, closes bung, the soaking at room temperature 1-1.5 month, obtains soak solution in bucket;
Shrinkproof permeability evaluation procedure:
Get zero standard plate to be immersed in tank liquor I and to carry out electrophoresis, obtain electrophoresis pre-processed board A, be placed to dry tack free by room temperature after water cleaning; Get soak solution in bucket, electrophoresis pre-processed board A is immersed 2 ~ 5 seconds and slowly mentions afterwards, room temperature is placed to dry tack free, and baking, evaluates shrinkproof permeability;
Corrosion resistance evaluation procedure:
1) soak solution in bucket is outwelled, painting situation in observing; And
2) soak solution in the bucket adding tank liquor amount 5% in tank liquor I, obtains tank liquor II; Get zero standard plate to be immersed in tank liquor II and to carry out electrophoresis, obtain electrophoresis pre-processed board B, with water cleaning, room temperature is placed to dry tack free, evaluates paint film and tank liquor II performance.
Further, in described shrinkproof permeability evaluation procedure and corrosion resistance evaluation procedure, electrophoresis sets electrophoretic parameters as swimming plate height 12 ~ 14cm, swimming plate temperature 28 ~ 30 DEG C, 30 seconds swimming plate voltage 180 ~ 220V to setting from swimming plate, then keep 150 seconds, thickness 20 ~ 22 μm, baking temperature 130 ~ 140 DEG C, baking time 20min.
Further, in described shrinkproof permeability evaluation procedure, baking is 140 ~ 160 DEG C of bakings 10 ~ 30 minutes.Such as, POWERNICS120M F-2(NJ) baking condition of coating is 160 DEG C and keeps 10 minutes; The baking condition of POWERNICS EXCEL1200F-2 (GD) coating is 140 DEG C and keeps 20 minutes.
Described electrophoresis is joined in groove at electrophoresis and is carried out.Before use, first electrophoresis is joined tank therefor to clean up.Normally: washing hand with soap → bring plastic gloves → absolute ethyl alcohol wash container → washing agent wash container → water wash vessel from the beginning → pure water wash vessel 3 times → by water clean, clean up for subsequent use.
Tank liquor I selects existing tank liquor.Preferably, tank liquor I is containing pure water 580 ~ 620 parts, main emulsion 460 ~ 500 parts, mill base 100 ~ 140 parts in 1200 parts; After each composition mixing, tank liquor, under temperature 40 DEG C of conditions, stirs slaking 16 ~ 24 hours.After slaking, with pure water polishing volatile fraction.Wherein, main emulsion is the potpourri of amine-modified epoxy resin 23 ~ 28%, blocked isocyanate 4 ~ 6%, aqueous solvent 4 ~ 6% and pure water 65 ~ 75%.Described mill base is the potpourri of amine-modified epoxy resin 12 ~ 18%, pigment 40 ~ 50%, aqueous solvent 1 ~ 2% and pure water 35 ~ 45%.
Main emulsion can buy POWERNICS220F-2 (SF), the POWERNICS EXCEL1200F-2(NPZ of Nippon Paint (China) Co., Ltd.), POWERNICS EXCEL1200F-2(GD), POWERNICS EXCEL1200F-2(MESE).
Mill base can buy the POWERNICS220F-1BLACK (SF) of ippon coating Tianjin company limited, the POWERNICS EXCEL1200F-1BLACK (NPZ) of Nippon Paint (China) Co., Ltd., POWERNICS EXCEL1200F-1BLACK (GD), POWERNICS EXCEL1200F-1GRAY (MESE).
Before zero standard plate is immersed in tank liquor, tank liquor can be left standstill a period of time (such as, 20 minutes), after liquid stabilising, put into zero standard plate again.
Evaluating shrinkproof permeability, paint film and tank liquor performance can metrics evaluation conventionally.Particularly, in shrinkproof permeability evaluation procedure, large shrinkage cavity in not existing, the average each plate face of little shrinkage cavity is less than one, and every block plate two sides summation is less than two, can think that shrinkage cavity experiment is passed through.In corrosion resistance evaluation procedure, interior painting flat appearance is smooth, and color is without exception; Paint film is without foaming, without coming off; Paint film, seam crossing non-corroding; Be coated with firm in paint film, nail no marking; The flat appearance of paint film is smooth, without exception; The conductivity of tank liquor, MEQ, application voltage, disintegration voltage, coulombic efficiency meet formula technique index, can think that corrosion resistance experiment is passed through.Disintegration voltage measures the maximum voltage that electrophoretic coating does not destroy film.
When evaluating tank liquor II, the design parameter of tank liquor is: pH is 5 ~ 7, and conductivity is that 1200 ~ 2000 μ s/cm, MEQ are 20 ~ 30mmol/100g, application voltage is 100 ~ 250V, disintegration voltage is 250 ~ 350V, can think and meet formula technique index.
The invention has the advantages that:
The present invention has filled up the vacancy of electrophoretic coating pail pack inside coating evaluation method; For electrophoretic coating, its thoroughly evaluating performance of interior painting, and in long-time placement situation in be coated with bucket to the influence degree of electrophoretic coating quality; By carrying out checking and appraising to the corrosion-resistant of electrophoretic coating pail pack and impact having excellent resistance to cratering before production in enormous quantities uses, judge that whether the corrosion resistance after pail pack storage, shrinkproof permeability be qualified, effectively get rid of underproof pail pack, ensure that electrophoretic coating quality does not affect quality because of the condition of packing material.
Embodiment
Embodiment
An evaluation method for the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating, comprises the following steps:
Preparation process:
Get in new metal and be coated with bucket, in bucket, add soak solution, soak solution composition is water: methylisobutylketone: 85% formic acid=100:10:4, and soak solution addition is 50% of bucket volume, and close bung, soaking at room temperature one month, obtains soak solution in bucket;
Shrinkproof permeability evaluation procedure:
Get zero standard plate to be immersed in tank liquor I and to carry out electrophoresis, obtain electrophoresis pre-processed board A, be placed to dry tack free by room temperature after water cleaning; Get soak solution in bucket, electrophoresis pre-processed board A is immersed 2 ~ 5 seconds and slowly mentions afterwards, room temperature is placed to dry tack free, and baking, evaluates shrinkproof permeability;
Corrosion resistance evaluation procedure:
1) soak solution in bucket is outwelled, painting situation in observing; And
2) soak solution in the bucket adding tank liquor amount 5% in tank liquor I, obtains tank liquor II; Get zero standard plate to be immersed in tank liquor II and to carry out electrophoresis, obtain electrophoresis pre-processed board B, with water cleaning, room temperature is placed to dry tack free, evaluates paint film and tank liquor II performance.
In described shrinkproof permeability evaluation procedure and corrosion resistance evaluation procedure, electrophoresis sets electrophoretic parameters as swimming plate height 12 ~ 14cm, swimming plate temperature 28 ~ 30 DEG C, the 30 seconds swimming plate voltage to setting from swimming plate, then keep 150 seconds, thickness 20 ~ 22 μm, baking temperature 130 ~ 140 DEG C, baking time 20min.
In described shrinkproof permeability evaluation procedure, baking is 140 ~ 160 DEG C of bakings 10 ~ 30 minutes.Such as, POWERNICS120M F-2(NJ) baking condition of coating is 160 DEG C and keeps 10 minutes; The baking condition of POWERNICS EXCEL1200F-2 (GD) coating is 140 DEG C and keeps 20 minutes.
Described electrophoresis is joined in groove at electrophoresis and is carried out.Before use, first electrophoresis is joined tank therefor to clean up.Normally: washing hand with soap → bring plastic gloves → absolute ethyl alcohol wash container → washing agent wash container → water wash vessel from the beginning → pure water wash vessel 3 times → by water clean, clean up for subsequent use.
Tank liquor I is containing pure water 580 ~ 620 parts, main emulsion 460 ~ 500 parts, mill base 100 ~ 140 parts in 1200 parts; After each composition mixing, tank liquor, under temperature 40 DEG C of conditions, stirs slaking 16 ~ 24 hours.After slaking, with pure water polishing volatile fraction.Wherein, main emulsion is the potpourri of amine-modified epoxy resin, blocked isocyanate, aqueous solvent and pure water.Described mill base is the potpourri of amine-modified epoxy resin, pigment, aqueous solvent and pure water.
In shrinkproof permeability evaluation procedure, large shrinkage cavity in not existing, the average each plate face of little shrinkage cavity is less than one, and every block plate two sides summation is less than two, can think that shrinkage cavity experiment is passed through.In corrosion resistance evaluation procedure, interior painting flat appearance is smooth, and color is without exception; Paint film is without foaming, without coming off; Paint film, seam crossing non-corroding; Be coated with firm in paint film, nail no marking; The flat appearance of paint film is smooth, without exception; The conductivity of tank liquor, MEQ, application voltage, disintegration voltage, coulombic efficiency meet formula technique index, can think that corrosion resistance experiment is passed through.
When evaluating tank liquor II, the design parameter of tank liquor is: pH is 5 ~ 7, and conductivity is that 1200 ~ 2000 μ s/cm, MEQ are 20 ~ 30mmol/100g, application voltage is 100 ~ 250V, disintegration voltage is 250 ~ 350V, can think and meet formula technique index.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here cannot give exhaustive to all embodiments.Every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (4)
1. an evaluation method for the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating, is characterized in that, comprise the following steps:
Preparation process:
Get in new metal and be coated with bucket, in bucket, add soak solution, soak solution composition is water: methylisobutylketone: 85% formic acid=100 ~ 120:10 ~ 12:4 ~ 5, soak solution addition is 50% of bucket volume, close bung, the soaking at room temperature 1-1.5 month, obtain soak solution in bucket;
Shrinkproof permeability evaluation procedure:
Get zero standard plate to be immersed in tank liquor I and to carry out electrophoresis, obtain electrophoresis pre-processed board A, be placed to dry tack free by room temperature after water cleaning; Get soak solution in bucket, electrophoresis pre-processed board A is immersed 2 ~ 5 seconds and slowly mentions afterwards, room temperature is placed to dry tack free, and baking, evaluates shrinkproof permeability;
Corrosion resistance evaluation procedure:
1) soak solution in bucket is outwelled, painting situation in observing; And
2) soak solution in the bucket adding tank liquor amount 5% in tank liquor I, obtains tank liquor II; Get zero standard plate to be immersed in tank liquor II and to carry out electrophoresis, obtain electrophoresis pre-processed board B, with water cleaning, room temperature is placed to dry tack free, evaluates paint film and tank liquor II performance;
Tank liquor I is containing pure water 580 ~ 620 parts, main emulsion 460 ~ 500 parts, mill base 100 ~ 140 parts in 1200 parts; After each composition mixing, tank liquor, under temperature 40 DEG C of conditions, stirs slaking 16 ~ 24 hours; After slaking, with pure water polishing volatile fraction; Wherein, main emulsion is the potpourri of amine-modified epoxy resin, blocked isocyanate, aqueous solvent and pure water; Described mill base is the potpourri of amine-modified epoxy resin, pigment, aqueous solvent and pure water.
2. the evaluation method of the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating according to claim 1, it is characterized in that, in described shrinkproof permeability evaluation procedure and corrosion resistance evaluation procedure, electrophoresis sets electrophoretic parameters as swimming plate height 12 ~ 14cm, swimming plate temperature 28 ~ 30 DEG C, from swimming plate, 30 seconds swimming plate voltage 180 ~ 220V to setting, then keep 150 seconds, thickness 20 ~ 22 μm, baking temperature 130 ~ 140 DEG C, baking time 20min.
3. the evaluation method of the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating according to claim 1, is characterized in that, in described shrinkproof permeability evaluation procedure, baking is 140 ~ 160 DEG C of bakings 10 ~ 30 minutes.
4. the evaluation method of the corrosion-resistant and shrinkproof permeability of electrophoretic coating pail pack inside coating according to claim 1, it is characterized in that, tank liquor I is containing pure water 580 ~ 620 parts, main emulsion 460 ~ 500 parts, mill base 100 ~ 140 parts in 1200 parts; After each composition mixing, tank liquor, under temperature 40 DEG C of conditions, stirs slaking 16 ~ 24 hours; After slaking, with pure water polishing volatile fraction; Wherein, main emulsion is the potpourri of amine-modified epoxy resin 23 ~ 28%, blocked isocyanate 4 ~ 6%, aqueous solvent 4 ~ 6% and pure water 65 ~ 75%; Described mill base is the potpourri of amine-modified epoxy resin 12 ~ 18%, pigment 40 ~ 50%, aqueous solvent 1 ~ 2% and pure water 35 ~ 45%.
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| CN103558338A (en) * | 2013-10-12 | 2014-02-05 | 奇瑞汽车股份有限公司 | Method for detecting pollutant causing contraction cavity on automobile finish |
| CN104360044B (en) * | 2014-11-13 | 2015-12-02 | 廊坊立邦涂料有限公司 | A kind of automobile coating shrinkage cavity detection method |
| CN108303520B (en) * | 2018-02-12 | 2019-09-24 | 安徽江淮汽车集团股份有限公司 | A kind of defeated paint mixing system shrinkage cavity test method of painting dressing automobiles |
| CN112051207B (en) * | 2020-09-13 | 2022-03-29 | 西南石油大学 | Online evaluation device and evaluation method for corrosion inhibitor coating effect of gas gathering pipeline in mountainous area |
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| CN1900191A (en) * | 2006-07-13 | 2007-01-24 | 上海金力泰化工股份有限公司 | Resin containing biamide structure, cathode electrophoretic paint containing said resin and their preparing method |
| CN101430271A (en) * | 2007-11-07 | 2009-05-13 | 中国科学院海洋研究所 | Apparatus and method for monitoring metal corrosion under organic coating |
| CN102494990A (en) * | 2011-12-08 | 2012-06-13 | 天津大学 | Sensor for measuring corrosion of inner wall of metal tank body and monitoring method |
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| JP4596947B2 (en) * | 2005-03-25 | 2010-12-15 | 財団法人石油産業活性化センター | Method for evaluating corrosion resistance of materials under ammonium hydrosulfide environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1900191A (en) * | 2006-07-13 | 2007-01-24 | 上海金力泰化工股份有限公司 | Resin containing biamide structure, cathode electrophoretic paint containing said resin and their preparing method |
| CN101430271A (en) * | 2007-11-07 | 2009-05-13 | 中国科学院海洋研究所 | Apparatus and method for monitoring metal corrosion under organic coating |
| CN102494990A (en) * | 2011-12-08 | 2012-06-13 | 天津大学 | Sensor for measuring corrosion of inner wall of metal tank body and monitoring method |
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Effective date of registration: 20160129 Address after: No. two, Fenghua Road, Guangzhou economic and Technological Development Zone, Guangdong, Patentee after: NIPPON PAINT ( Guangzhou ) Co.,Ltd Address before: 201201 No. 287, pioneering Road, Shanghai, Pudong New Area Patentee before: Nippon Industrial Paint (Shanghai) Co., Ltd. |