Any agreement actually negotiated between the bargaining agent and the corporate authorities either before or within 30 days after mediation shall constitute the collective bargaining contract governing firefighters and the municipality for the period stated therein. Such period shall not exceed one year.

Any collective bargaining agreement negotiated under this chapter shall specifically provide that the firefighters who are subject to its terms shall have no right to engage in any work stoppage, slowdown, or strike, the consideration for such provision being the right to a resolution of disputed questions. Whether or not a collective bargaining agreement has been negotiated, no firefighter shall engage in any work stoppage, slowdown, or strike at any time.