AFTER PLATING DEFECTS
IN CSSC,SSC COVERS
KUHU INDUSTRIES PRIVATE
LIMITED
PLATING DEFECTS
WHITE PATCHES
WATER MARKS
COLOUR VARIATION
BURNING MARKS
SST FAILURE
DEFECTIVE PARTS
CONTAINMENT ACTION TAKEN
Prevention: 2-3 Dips in 1-2% concentrated Cutting
oil DM water based solution to prevent moisture
and defects formed due to moisture.
Detection: Curing to follow strictly at least 48
Hours and Curing area shifted to closed area
protected from external environment condition.
PROBLEM REPORTED
Problem Occurs:
• SST Failure at customer end .
• White rust Occurs within 24 hours.
• Cutting oil dipping has been considered as one of
Probable cause.
Containment Action Taken:
• Cutting oil dips immediately stopped.
• Further Root cause validation under process.
• Top Coat process added after Plating
ROOT CAUSE VALIDATION
S. No.
Possible Root Cause
Validation Method
Observation
1.
Cutting Oil Dips after
Passivation
Salt Spray Test Inhouse & 3rd Party
SST Test
2.
Passivation Concentration
30-40 gm/Litr
Lab concentration test
Tested & Found 38gm/litr
OK
1.
2.
1.
3.
4.
Final Packaging of SSC
Covers
Improper Drying
Drying temperature
50-70 °C
Existing Raping Packaging
Open loose Packaging
Comparison of both in
different-different packing
conditions
Temperature check inside oven by
infrared surface temperature
Meter
2.
Verified dryer temperature
at oven surface, Found 50°
C+ at different-different
location
1.
5.
TDS of water rinse after
passivation
(Should be 5-15)
1.
2.
Inhouse TDS check by TDS
meter
3rd Party TDS check
Existing Raping
packaging under
monitoring
Open loose packaging
2.
TDS found 49 for DM
water
DM water plant
needsmentainance will
be done by 30/8.22
Status
24 hr parts are
failing.
Completed
checked after
1week OK
Completed
Ongoing
ROOT CAUSE VALIDATION
S. No.
Possible Root Cause
Validation Method
Observation
Status
3rd Water rinse for extra cleansing
added in process
better less water marks and
white marks
complete
1 testing
pending
samples to be
sent to sigma
ongoing
6.
Add 3rd Water Rinse after
Passivation
7.
SST test comparison study
for below mentioned
conditions to validate best
one:
1. With Cutting Oil Dips
2. With Top Coat
3. Without Topcoat and
Cutting Oil
SST test Report and results
Under process SST Test
passivation+cutting oil fail
in sst 24 hrs
passivation +top coat not
checked
passivation parts are failing
24 hrs
8
Third party verification by
kuhu
Parts sent to third part for
verification
samples received by third
party on 28/7/22
9
Third part verification by
sigma
10
passivation impurities to be
checked
Parts sent to third partfor
verification
samples sent to third part
observation not shared
samples not received by
third party
ongoing
ongoing