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Poor adhesion of Phosphating on Cr-Moly alloy

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I am currently using Heavy Zinc to phosphate material that having the following composition:-
C : 0.24 � 0.26%,Si : 0.26 � 0.30%,Mn : 0.77 � 0.83%,P : 0.007- 0.010%,S : 0.003 � 0.005%
Cr : 1.07 � 1.10%,Mo : 0.31 � 0.32%,Al : 0.040 � 0.047%

My problem is due to high content of Chromium/Molibdenum, the phosphating has a poor adhesion. Can anyone has an idea on how to improve the adhesion?

Many Thanks,

Jude James
Oil and Gas - Malaysia

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