PRODUCT DESCRIPTION
BONDERITE® M-CR NR-6207 RT provides the following product
characteristics:
Technology
Product Type
Application
Metal pretreatment
Chromating
Chromating of Aluminium
BONDERITE® M-CR NR-6207 RT is a liquid Chromium-VI-free
pretreatment designed for use on aluminium and its alloys.
BONDERITE® M-CR NR-6207 RT coatings show good corrosion
resistance and paint bonding characteristics.
Application areas
For food grade applications with organic coating systems
pasteurising and sterilising tests give good results. In connection
with these tests, very good feathering-test results with AlMg5 alloys
can be achieved. Since only fresh solution is used, there are no bath
control or replenishment operations. When using BONDERITE® M
CR NR-6207 RT, a rollcoater or chemcoater is necessary. No final
rinse is required after conversion treatment.
TECHNICAL DATA
Density (20°C), g/mL
pH (1 % solution)
Chrom(III)-content, mL 0.1 Na2S2O3
(5 mL sample, 25 Vol.% solution)
DIRECTIONS FOR USE
1.07 to 1.11
2.7
~23.7
Preliminary statement:
Prior to use it is necessary to read the Material Safety Data Sheet
for
information about precautionary measures and safety
recommendations. Also, for chemical products exempt from
compulsory labeling, the relevant precautions should always be
observed. Please also refer to the local safety instructions and
contact Henkel for analytical support.
Application
The concentration depends on the wet-film thickness and the
desired coating weight:
BONDERITE® M-CR NR-6207 RT
5 to 50 Vol. %
Coating Weights:
20 to 50 mg/m2 Cr
At a wet film of 6 ml/m2 a concentration of 12.5 Vol.%
results in a coating weight of 25 mg/m2 Cr.
Process description:
1. Cleaning
2. Hot water rinsing
3. Drying
4. BONDERITE® M-CR NR-6207 RT
5. Oven drying
1
. Cleaning:
All metal must be free of grease, oil, rust, scale and other foreign
matter before the coating solution is applied. A complete line of
BONDERITE cleaners is available. Details for the proper one can be
taken from the technical data sheets.
2
. Hot water rinsing:
After cleaning, the parts are thoroughly rinsed with hot water. The
overflow rate should be high enough to keep the rinse clean and free
from scim and contamination.
3
. Drying:
The strip must be dry prior to application of the treatment solution.
4. BONDERITE® M-CR NR-6207 RT
The coating solution is applied at temperatures from 20 to 25°C, in a
uniform film to the properly cleaned strip. The coated strip
be rinsed.
5
should not
. Oven drying:
The treated strip is passed through a dry-off oven. The Peak Metal
temperature (PMT) has to be at least 65°C. Best results are
observed with a PMT of 100°C. Humidity in the oven should be
<20%.
Equipment:
The holding tank, pump, piping and solution trays should be
constructed of stainless steel.
The holding tank and piping may be constructed of, or lined with
plastic (PVC etc.).
The applicator rolls should be constructed of polyurethane or
Hypalon, shore hardness 50 to 70.
The pick-up rolls should be engraved and chromium plated.
Caution:
BONDERITE® M-CR NR-6207 RT contains chromium-III-fluoride
<10% and phosphoric acid <10% in solution.
Classification:
Please refer to the corresponding Material Safety Data Sheets for
details on:
Hazards identification
Transport information
Regulatory information
Storage:
15 to 30

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