Schwego Corrit Description - European-coatings.com

Schwego ® Corrit 

A Paint Additive Against Residual Rust 

Description 

Schwego ® Corrit is used in waterbased systems as an autonomous corrosion 

protection additive. It can also be combined with zinc phosphate resp. other pigments 

and thus it can be incorporated in primer finishes as an additional long term corrosion 

protection additive. 

Typical applications : 

DIY systems 

Maintenance paints 

One coat corrosion protection primers 

Corrosion protection primers 

Practice 

The effectiveness of anticorrosive coatings mainly depends on the thoroughness of the 

substrate pretreatment. A thoroughly derusted, dry and fatfree substrate is a 

precondition for long term protection against corrosion. 

These optimum conditions are not often available in practice : 

Residual rust frequently remains on the surface and in the pores. 

The coating appears to confer satisfactory protection against rust. 

Result after several months : rust destroys the new coating from below. 

Solution 

The paint additive Schwego ® Corrit passivates existing residual rust by changing it to a 

very stable metal complex. The result is a lasting corrosion proteciton. It aids substrate 

wetting and improves the adhesion of the coating. Paints containing Schwego ® Corrit 

can be applied directly onto rusty surfaces – after removal of loose rust particles. 

Composition 

Schwego ® Corrit is a paint additive based on a chelate forming agent and a wetting 

agent component 

The above information is based on our current knowledge and experience. No binding assurance in respect of certain properties or suitability for certain 

applications must be read into our information. Patent rights and other proprietary rights must be observed if necessary. Further safety instructions 

please learn from our material safety data sheet. 2005y12m2d 

Bernd Schwegmann GmbH & Co. KG · Wernher-von-Braun-Str. 14 · 53501 Grafschaft-Gelsdorf · Germany 

Tel.: +49 (0) 2225 9226-0 · Fax +49 (0) 2225 9226-33 · e-mail: info@SchwegmannNet.de · www.SchwegmannNet.de

Mode of action 

As the structure of the unstable Fe3 ⊕ formed during air oxidation is porous it does not 

prevent further air and moisture from coming into contact with the metal. Finally the 

metal is completely rusted. 

The functions of Schwego ® Corrit are : 

a) to prevent the contact of materials that have a corrosive effect (mechanical effect) or 

/ and 

b) to interfere into the electromechanical corrosion process in such a way that it is 

prevented or at least slowed down (electromechanical process). 

Schwego ® Corrit helps to protect the material from corrosion by activating both 

protection mechanisms, as the chelate forming agent of Schwego ® Corrit forms a 

virtually insoluble chelate complex with the Fe-ions that are present in the rust layer. 

Due to the insolubility of the chelate complex the Fe-ions are linked so tightly that they 

cannot continue the electro-mechanical corrosion. Thus a barrier is formed that makes 

it practically impossible for the oxygen to attack metallic substrate. 

The result is a stable metal-organic layer adhered to the metal surface that will no 

longer oxidize. So not only is a highly effective and durable corrosion protection is 

achieved but additionally there is virtually a chemical linkage between the metallic 

substrate and the organic coating. 






Testing : 

When testing a coating system containing Schwego ® Corrit it is essential that the test 

substrates show residual rust (at least an oxidated surface). 

A rusty panel should be roughly derusted for your own lab tests. 

Especially if the resin is rather alkaline a predilution is recommended and the Schwego 

Corrit should be added very slowly and carefully to avoid local overdose that will result 

in specks which are difficult to destroy. For this most common solvents can be used, i. 

e. glycol, higher alcohols, water, etc. By doing this we found no problems with any of 

the cross-section of commonly used resin types we tested. Whenever possible 

Schwego Corrit should be added at the beginning to the mill base. But it is also possible 

to add it afterwards. In this case a predilution is advisable as described above and the 

product should be added with high shear rate. 

We recommend evaluation of the Schwego Corrit using outdoor weathering. 

Accelerated weathering tests (e.g. salt spray test) give misleading practical values 

because of the high initial deterioration. 

In the sample bottle it could happen that the surface of the product turns to green 

gradually. This shift in colour is not a precipitation but a "cosmetic" problem. This does 

not affect the properties or the effectiveness of the product but influences only its 

appearance. The change in colour is caused by a very little oxidation of the air and the 

formation of this oxidation product is reversible. That means it will be immediately 

destroyed when the Schwego Corrit reacts with the iron surface. Unfortunately the shift 

in colour is visible at concentrations on the ppb level. 






****************Formulation suggestion********************* 

Description: Acryl-thick film paint- white 

contains SCHWEGO CORRIT 

high gloss 

Basis : Primal HG 76 pure acrylate dispersion 

composition: 

TiO2 2190 (Kronos) 30,0% 

Schwego PUR 8020 (Schwegmann) 0,5% 


Propyleneglycole 8,0% 

Water 5,8% 

SCHWEGO CORRIT (Schwegmann) 1,0% 

Dissolve up to a fineness of grind 20my 

then prepare the binder and incorporate the paste slowly 

Primal HG 76 (Rohm&Haas) 47,1% 

add slowly while stirring 

Blister Free 45 (Schwegmann) 0,5% 

Schwego Wett 8090 (Schwegmann) 3,5% 

Schwego Flow 8058 (Schwegmann) 1,0% 

Preserving agent 0,1% 

Texanol 2,0% 

stir well and slowly add Antigel 

Antigel (Schwegmann) 1,0% 

Total formulation amount: 100 % 

Processing: 

Disperse the items 1 to 5 finely up to 20my, 

then prepare item 6 and incorporate the paste slowly 






then add the items 7 up to 10 slowly and stir well at least 15 minutes, then add item 11 

slowly 


Description: Acryl – silk flat finish black 


Basis : Liocryl AM 912 pure acrylic, without solvents and plasticizers 

Composition: 

Water 10,0% 

Propylene glykol 8,0% 




premix well, then add: 

Liocryl AM 912 (Synthopol) 68,9% 

Colanylschwarz (black) (Hoechst) 8,0% 

Texanol (Eastman) 2,0% 


Matting agent OK 500 (Degussa) 0,8% 

Total formulation amount: 100% 

Processing: 

Thoroughly premix the items 1 to 4, 

then incorporate the items 5 to 9 while agitation 






****************Formulation Suggestion********************* 

Description: aquous metal primer grey around RAL7000 


Basis : Neocryl XK 62 styrene-acrylate dispersion 

Composition: 

Butyldiglykol 5,00% 






SCHWEGO CORRIT (Schwegmann) 1,0 % 

premix 

TiO 2 Kronos 2190 (Kronos) 6,00% 

Silicic acid HDK N20 (Wacker) 0,50% 

Halox BW 191 Lawrece Industries) 4,00% 

Microdol extra (Omya) 11,00% 

Disperse up to a fineness of grind of 15-20 my around 20min 

then prepare the following items and add the above mentioned paste slowly and stir 

Neocryl XK 62 (Zeneca) 61,29% 

Texanol (Eastman) 2,00% 

Colanylschwarz (black) N131 (Hoechst) 0,20% 

Colanylblau (blue) B2G100 (Hoechst) 0,01% 

Total formulation amount : 100,0% 

Processing: 

Weigh the items 1 up 6 and mix them well, then add the items 7 to 10 and mix them, 

disperse them with the use of a dissolver up to a fineness of 15 to 20 my 

Prepare item 11 and slowly add the white paste, then slowly add the items 12 to 15 

while stirring 






****************Formulation Suggestion********************* 

Description: aqueous metal primer red oxide 

contains Schwego Corrit 3% 

Basis : Alberdingk AS 2681 Acrylate acid ester 

Composition: 

destilled H 2 O 10,40% 

Dowanol DPM 3,80% 

Schwego Foam 8013 (Schwegmann) 0,60% 

Talkum AT extra (Norwegian Talc) 5,00% 

Microdol Extra (Omya) 8,00% 

Zinc phosphat ZP 10 (Heubach) 10,00% 

Zinc white Harzsiegel (Heubach) 0,50% 

Bayferrox 130 M (Bayer) 8,50% 

Schwego Pur 8050 (Schwegmann) 1,20% 

propylene glycol 11,00% 

Schwego Corrit (Schwegmann) 3,00% 

Dissolver and then up to a fineness of grind of 15-20 my around 20min 

then prepare the following items and add the above mentioned paste slowly and stir 

Alberdingk AS 2681 (Alberdingk & Boley) 30,00% 

Haftharz EP-DS 1300 (Degussa Hüls) 3,00% 

Kunstharz EP-DS 50 (Degussa Hüls) 5,00% 

Total amount of the formulation: 100% 

Processing: 

Weigh the items 1 up to 10 and dissolve them, then add item 11 and disperse them with the aid 

of a dissolver up to a fineness of 25 –30 my. Prepare the items 12 to 14 and add them to the 

colour paste. 

For the adjustment of the viscosity : proplene glycole 

Additional hints : 

Schwego Corrit has been incorporated into this corrosion protection primer, because this 

product converts existing corrosion and it so prevents from the danger of rust beneath the 

paint. Therefore this corrosion protection primer has an improved adhesion and protects 

against rust well. 







Description: Acryl-thick film paint- light grey 


high gloss 

Basis : Primal HG 76 pure acrylate dispersion 

composition: 

TiO2 2310 Kronos 30,0% 



Propyleneglycole 8,0% 


Water 5,8% 

Schwego Foam 8325 (Schwegmann) 0,4% 


Dissolve up to a fineness of grind 20my 

then prepare the binder and incorporate the paste slowly 

Primal HG 76 (Rohm&Haas) 47,1% 

add slowly while stirring 


Preserving agent 0,1% 

Texanol 2,0% 

Schwego Fluor 8039 (Schwegmann) 0,1% 

Colanyl black (Hoechst) 1,0% 

Total formulation amount: 100 % 

Processing: 

Disperse the items 1 to 5 finely up to 20my, 

then prepare item 6 and incorporate the paste slowly 

then add the items 7 up to 10 slowly and stir well at least 15 minutes, then add item 11 

slowly

Schwego Corrit Description - European-coatings.com

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