Marriage certificates of civil status only become public after 75 years. Also don't forget to check the marital attachments, Open Archives often provides links to this. Civil status records are always drawn up in duplicate: one goes to the municipality where the event took place and ends in the municipal or regional archive, the other goes through the court to the provincial archive (RHC).
This index contains 43,519,151 historical person listings.
The marriage certificates of the following sources can be searched here: