Arthur demanded greater all-round ruthlessness after his team took much longer than expected to complete a 45-run victory on Sunday in the first encounter.
South Africa were put into bat and ran riot in the afternoon sun to compile 331 for five off 50 overs before bowling Zimbabwe out for 119 after 34.3 overs and completing a 2-0 series win.
The Proteas used the mini-series against their lowly northern neighbours to warm up for a tour by England that begins on Friday and includes Twenty20, ODI and Test fixtures.
Duminy came in at number four and tormented the visiting attack to finish unbeaten on 111 after facing 87 balls in 126 minutes. His record score included nine fours and two sixes in a virtual chanceless effort as South Africa bettered the 295 scored against the minnows in Benoni.
Jacques Kallis, another player who missed the first match of the series through injury, struck an 81 that contained eight fours and two sixes and opener and skipper Graeme Smith bettered a run a ball in compiling 53.
Only Tatenda Taibu, offered any resistance to the SA attack, hitting 52 off 71 deliveries.
SCORE BOARD
SOUTH AFRICA
Smith st Taibu b Utseya 53
Kallis c Chigumbura b Utseya 81
De Villiers b Price 5
Duminy (not out) 111
Petersen lbw Price 13
Morkel c Madakadza b Price 14
Boucher (not out) 31
Extras (LB-4, W-19) 23
Total (for 5 wkts, 50 overs) 331
Fall of wickets: 1-108, 2-121, 3-199, 4-240, 5-273.
Bowling: Mpofu 10-0-75-0, Jarvis 10-0-76-0, Utseya 10-0-53-2, Price 10-0-55-3, Cremer 6-0-41-0, Chigumbura 4-0-27-0.
ZIMBABWE
Masakadza c Kallis b Langeveldt 0
Taylor c Kallis b Tsotsobe 0
Taibu c Boucher b Langeveldt 52
Matsikenyeri c Boucher b Morkel 13
Chigumbura c Smith b Morkel 4
Coventry c De Villiers b Morkel 10
Utseya lbw Van der Merwe 1
Cremer c & b Langeveldt 11
Price b Van der Merwe 9
Jarvis c McLaren b Merwe 13
Mpofu (not out) 1
Extras (LB-3, W-2) 5
Total (all out, 34.3 overs) 119
Fall of wickets: 1-0 (Masakadza), 2-8 (Taylor), 3-40 (Matsikenyeri), 4-44 (Chigumbura), 5-62 (Coventry), 6-73 (Utseya), 7-90 (Cremer), 8-95 (Taibu), 9-112 (Price).
Bowling: Langeveldt 8-2-36-3, Tsotsobe 7-2-23-1, McLaren 5-2-10-0, Morkel 6-2-20-3, Van der Merwe 8.3-0-27-3.
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